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April 17, 2014

Search: A ball is dropped from rest from a very tall building. Ignoring air friction, how far in meters will the ball fall vertically in 4.2 seconds?

Number of results: 59,231

physics
A man stands on the roof of a 19.0 m tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 30.0 degrees above the horizontal. Ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock ...
Wednesday, September 14, 2011 at 11:27pm by Meghan

Math Help (URGENT X10)
This is really urgent so please please please help. The height(H) of an object that has been dropped or thrown in the air is given by: H(t)=-4.9t^2+vt+h t=time in seconds(s) v=initial velocity in meters per second (m/s) h=initial height in meters(m) H=height h=initial height ...
Wednesday, April 4, 2012 at 10:42pm by Anonymous

college algebra
When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in feet (as if you were on top of...
Friday, January 15, 2010 at 8:32pm by Sherry

Physics
A baseball catcher puts on an exhibition by catching a 0.15-kg ball dropped from a helicopter at a height of 101 m. What is the speed of the ball just before it hits the catcher's glove 1.0 m above the ground? (g = 9.8 m/s2 and ignore air resistance)
Saturday, November 27, 2010 at 1:25pm by Matthew

physics
a man throws a rock horizontally off a building with an initial velocity of 22.4 m/s. it hits the ground 91.6 m from the building. how tall is the building? (positive value)
Thursday, October 30, 2008 at 9:35pm by corinne

Math
Montreal’s Marathon building is 195m tall. From a point level with, and 48m away from, the base of the building, what is the angle of elevation of the top of the building, to the nearest degree?
Wednesday, July 21, 2010 at 4:11pm by anonymous

physics
A ball dropped from a sixth floor window accelerates at 10 m/s^2 After 2 seconds it hits the ground. It bounces back with a velocity of −15 m/s 1.find the height from which the ball was dropped. 2. How high did it bounce?
Thursday, September 26, 2013 at 3:39pm by Anonymous

maths
A ball is dropped from a height of 1 metre. At every bounce it travels half of the height it travelled it with the previous flight. Find the total distance travelled when the ball comes to rest.
Thursday, December 27, 2012 at 8:25am by anitha

Physics
A ball is dropped from rest from 10 m above ground. The speed of the ball in the middle of trip to ground is close to Answer 14 m/s 10 m/s can't be determined because mass is not given 100 m/s
Wednesday, February 13, 2013 at 11:42pm by Del

Physics
Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far Ball 1 has fallen (to two decimal points) by the time Ball 2 is thrown.
Wednesday, September 12, 2012 at 8:03pm by Ashley

English
Use "a" before a word beginning with a consonant. ex. a building, a tall building Use "an" before a word beginning with a vowel. ex. an elephant, an extremely tall building.
Tuesday, January 13, 2009 at 4:11pm by GuruBlue

Physics
A baseball is hit with a speed of 29.0{\rm m/s} at an angle of 44.0{\rm ^\circ} . It lands on the flat roof of a 10.0{\rm m} -tall nearby building. If the ball was hit when it was 1.4{\rm m} above the ground, what horizontal distance does it travel before it lands on the ...
Thursday, January 31, 2013 at 5:09pm by Anonymous

physics
From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. h is 0.54 m and d is 8.0 m. Assume ...
Sunday, October 24, 2010 at 9:00pm by Gabbi

Physics. PLEASE HELP!!
A 1.3 kg steel ball and 8 m cord of negligi-ble mass make up a simple pendulum that can pivot without friction about the point O. This pendulum is released from rest in a horizontal position and when the ball is at its lowest point it strikes a 1.3 kg block sitting at rest on ...
Saturday, April 7, 2012 at 8:40pm by Amber

algebra 1
The formula for the height of a falling object is shown below, where h is the height of the object in meters, t is the time in seconds, and k is the height, in meters, from which the object began its fall. h = –4.9t² + k If a rock is dropped from a building that is 150 meters ...
Thursday, February 14, 2013 at 8:28pm by lily

Math
a ball rebounds 1/2 of the height from which it is dropped. The ball is dropped from a height of 136 feet and keeps on bouncing. How far will it traveled when it strikes the ground the third time?
Sunday, August 29, 2010 at 4:02am by Karen

algebra
im trying to help my son i have no ida about this stuff any help would be great When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (...
Tuesday, January 12, 2010 at 10:26pm by joni

Physics
A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. (Intro 1 figure) The spring has a spring constant k, the ball has a mass m, and the ramp rises a height y above the table, the surface...
Friday, October 31, 2008 at 10:33pm by Sam

physics
a ball is dropped from height of tower 300m .after 1s another ball is dropped with 20m/s from tower .when and where they meet?
Wednesday, August 24, 2011 at 7:23pm by armando

Math
Please help me with the following problem, I have submitted the answer: 88.2 and was told that it was incorrect. The word problem reads: If you do not consider air resistance, gravity causes a falling object to descend a distance of (9.8)t2 where t is the time in seconds. If a...
Wednesday, January 25, 2012 at 11:02pm by Please Please Help

math,correction
can someone correct this for me thanks A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. Use this information for exercises 35 to 38. Science and medicine. When will the ball reach a height of 80 m? h = -5t^2+20t+100 My answer: ...
Thursday, April 5, 2007 at 9:35pm by jasmin20

Physics
So if I dropped the same ball twice at different heights suppose 1m and 500m the ball that was dropped at 500m would have a lower acceleratino but greater velocity?
Thursday, April 2, 2009 at 10:40am by Lena

physics
A basketball player 1.9 m tall wants to make a basket from a distance of 7.8 m. The hoop is at a height of 3.05 m.If he shoots the ball (from a height of 1.9 m) at a 23.5 angle, at what initial speed must he shoot the basketball so that it goes through the hoop without ...
Tuesday, October 16, 2012 at 2:18pm by scott

Physics
A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, jumps onto a 12.2 kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (b) The sled and person coast 30.0 m...
Wednesday, February 28, 2007 at 10:06pm by Mary

physics
A woman throws a ball at a vertical wall 40m away the ball is 20m above the ground when it leaves woman's hand with an initial velocity of 14m/s at 45degrees.when the ball hits the wall the horizontal component of its velocity remain unchanged.(a)where does the ball hit the ...
Thursday, October 8, 2009 at 10:47am by Tina

Physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 600 N, to the ...
Tuesday, February 13, 2007 at 10:17pm by winterWX

physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 760 N, to the ...
Saturday, December 6, 2008 at 6:45pm by johnny

physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 760 N, to the ...
Thursday, December 11, 2008 at 8:07pm by johnny

Physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 760 N, to the ...
Wednesday, February 14, 2007 at 10:51pm by johnny

physics
In 1956, Frank Lloyd Wright proposed the construction of a mile-high building in Chicago. Suppose the building had been constructed. Ignoring Earth's rotation, find the change in your weight if you were to ride an elevator from the street level, where you weigh 580 N, to the ...
Friday, July 16, 2010 at 7:42pm by Sam

physics
The physics of a golf ball and kinetic energy. When a 0.045 kg golf ball takes off after being hit, its speed is 41 m/s. a) What is the kinetic energy of the ball after it has been hit? b) How much work is done on the ball by the club? c) Assume that the force of the club acts...
Sunday, April 24, 2011 at 6:26pm by aly

physics
A tennis ball of mass 100g is dropped from a height of 40m.It hits the ground and bounces back to a height of 30m after an impact of 0,01s.Ignore the air resistance .what was the velocity of the ball when it hit the ground ?
Sunday, February 5, 2012 at 9:04am by kulani

PHYSICSSSSSS please help
An 60 kg skier is sliding down a ski slope at a constant velocity. The slope makes an angle of 13° above the horizontal direction. (a) Ignoring any air resistance, what is the force of kinetic friction acting on the skier? in N (b) What is the coefficient of kinetic friction ...
Monday, February 13, 2012 at 12:01am by Anonymous

physics
Solve this equation for t: (Thrown) Ball 1 height = (Dropped) Ball 2 height 26.7 t - 4.9 t^2 = 13.1 - 4.9 t^2 The acceleration terms, -4.9 t^2, cancel out t = 13.1/26.7 = ___ seconds Interesting result, and one that hints at Einstein's principle of equivalence. In a free-...
Sunday, January 23, 2011 at 1:13pm by drwls

Physics
A stone is dropped from the top of a 83.0 m tall building. How far above the ground is the stone 1.60 seconds before it reaches the ground?
Saturday, March 8, 2014 at 1:06pm by Yarielis

physics please help
A soccer ball is kicked from the top of a 256 -foot building with an initial velocity of 6 ft/s. How far from the base of the building will the ball land?
Sunday, October 19, 2008 at 4:05pm by carissa

physics
1. A child stands before a tall building and wants to know how high it is. She notices that it is a sunny day, so armed with a meter stick, the fact that she is 1.2 meters tall, and a knowledge of similar triangles, she proceeds to measure the building’s height by comparing ...
Thursday, September 6, 2012 at 12:24pm by Steph

Physics
Part 1: Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far apart Ball 1 and Ball 2 are after 5.02 seconds from when Ball 1 was ...
Wednesday, September 12, 2012 at 8:14pm by Ashley

Physics
Part 1: Two balls (Ball 1 and Ball 2) are released from the top of a tower. Ball 2 is thrown 3.14 seconds after Ball 1 is dropped. Ball 2 is thrown downward with a velocity of 3.49 m/s. Determine how far apart Ball 1 and Ball 2 are after 5.02 seconds from when Ball 1 was ...
Wednesday, September 12, 2012 at 8:20pm by Ashley

physic
A ball is shot from the top of a building with an initial velocity of 16m/s at an angle θ = 43∘ above the horizontal. Part A What are the horizontal and vertical components of the initial velocity? If a nearby building is the same height and 55m away, how far below ...
Friday, October 11, 2013 at 5:14pm by koram

math
using this information: if an object is thrown straight up into the air from the height H feet per second then at time tseconds the height of the object is -16.1t^2 +Vt+ H feet. This formula uses only gravitational force, ignoring air friction. It is valid only until the ...
Friday, February 10, 2012 at 12:55am by deana

math
using this information: if an object is thrown straight up into the air from the height H feet per second then at time tseconds the height of the object is -16.1t^2 +Vt+ H feet. This formula uses only gravitational force, ignoring air friction. It is valid only until the ...
Friday, February 10, 2012 at 11:39am by deana

Physics
suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
Sunday, February 9, 2014 at 8:36pm by Juanita

Physics
suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
Sunday, February 9, 2014 at 9:07pm by Juanita

MATH URGENT!
Madison is standing on the roof of a building that is 350 feet above the floor. She throws a ball straight up with a velocity of 20 feet per second. How long will the ball be in the air before it hits the ground?
Thursday, April 7, 2011 at 11:52pm by lily

physics
The spring in the muzzle of a child's spring gun has a spring constant of 780 N/m. To shoot a ball from the gun, first the spring is compressed and then the ball is placed on it. The gun's trigger then releases the spring, which pushes the ball through the muzzle. The ball ...
Wednesday, March 21, 2012 at 3:02pm by kassie

physic
If A Ball Is Dropped From Rest And Falls 4 Meters In 0.8 Seconds, What Is The Final Velocity When It Reaches The 4 M?
Sunday, November 29, 2009 at 6:41pm by nesha

Physics
A ball dropped from rest on to horizontal ground 20m between rebounds with 3/4 of the velocity with which it hits the ground find time that elapses between the first and second in part of the ball with the ground
Sunday, October 2, 2011 at 6:05pm by Anonymous

Physics
On a planet that has no atmosphere, a rocket 14.2 m tall is resting on its launch pad. Freefall acceleration on the planet is 4.45 m/s2. A ball is dropped from the top of the rocket with zero initial velocity. (a) How long does it take to reach the launch pad? (b) What is the ...
Wednesday, October 20, 2010 at 6:09pm by Maria

physics
A small rock is thrown vertically upward with a speed of 13.0from the edge of the roof of a 37.0 tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A) What is the speed of the rock just before ...
Monday, September 3, 2012 at 5:30pm by joe

Physics
A soccer player kicks a ball into the air at an angle of 36.0 Degrees above the horizontal. The initial velocity of the ball is +30.0 m/s. 1).How long is the soccer ball in the air 2).What is the horizontal distance traveled by the soccer ball? 3).What is the maximum height ...
Tuesday, January 17, 2012 at 12:10am by Daleda

Physics
You kick a soccer ball, compressing it suddenly to 2/3 of its original volume. In the process, you do 410 J of work on the air (assumed to be an ideal gas) inside the ball. (a) What is the change in internal energy of the air inside the ball due to being com-pressed? (b) Does ...
Thursday, February 25, 2010 at 10:15am by Baker

math. can someone explain this!
using this information: if an object is thrown straight up into the air from the height H feet per second then at time tseconds the height of the object is -16.1t^2 +Vt+ H feet. This formula uses only gravitational force, ignoring air friction. It is valid only until the ...
Friday, February 10, 2012 at 3:01pm by deana

physics 209
A mass m = 0.5 kg is hung from a pulley with moment of inertia I = 0.20kg⋅m2 and radius R = 10cm. There is friction in the pulley. The mass is dropped from rest, and after 2s it traveled 0.4m. What is the torque due to friction?
Monday, November 19, 2012 at 2:42pm by mike

physics
A ball is dropped from a high building. Using the approximate value of g = 10 m/s2, find the change in velocity between the fourth and seventh second of its flight
Sunday, February 5, 2012 at 9:04pm by Anonymous

physics
A 3kg basketball is dropped from the top of a 120m building. if all of the energy is converted into KE, what is the velocity of the ball just before it hits the ground
Monday, January 6, 2014 at 5:09pm by ShaSha

Physics
2. What is the speed of a 0.25kg ball if its kinetic energy is 15 J? my answer: 11m/s (1/2)(.25) * v^2 = 15 v = Yes, about 11 m/s 3. A ball is dropped off a high cliff. What quantity increases as the ball gets closer to the ground? my answer: I'm not too sure. It's either ...
Monday, February 3, 2014 at 12:16pm by Damon

math
A pole that is 2.9m tall casts a shadow that is 1.39m long. At the same time, a nearby building casts a shadow that is 36.75m long. How tall is the building.
Monday, August 2, 2010 at 8:27pm by Jessica Padilla

Physics/Science #3
A ball is thrown vertically downward from the top of a 35.9-m tall building. The ball then passes the top of a window that is 10.7 m above the ground 2.00 s after being thrown. What is the speed of the ball as it passes the top of the window? The equation for the speed of the ...
Thursday, January 25, 2007 at 4:14pm by TechnoBoi11

Pre-algebra
A pole that is 3.1m tall casts a shadow that is 1.64m long. At the same time, a nearby building casts a shadow that is 50.25m long. How tall is the building? Round your answer to the nearest meter.
Monday, May 7, 2012 at 10:15pm by Darlene

physics
A rock is shot vertically upward from the edge of the top of a tall building.The rock reaches its maximum height above the top of the building 1.90 s after being shot. Then, after barely missing the edge of the building as it falls downward, the rock strikes the ground 9.00 s ...
Thursday, September 12, 2013 at 4:55pm by kristy

physics
You throw a 1kg ball out of a window 12 meters above the ground with horizontal speed. It lands on the ground 5 meters from the building after 1 second. Ignore air resistance, A) How fast did you throw the ball? B) What was the ball's initial velocity? C) How fast was it ...
Tuesday, December 13, 2011 at 10:37pm by Geraldo

physics
You throw a 1kg ball out of a window 12 meters above the ground with horizontal speed. It lands on the ground 5 meters from the building after 1 second. Ignore air resistance, A) How fast did you throw the ball? B) What was the ball's initial velocity? C) How fast was it ...
Tuesday, December 13, 2011 at 10:44pm by Geraldo

physics
You throw a 1kg ball out of a window 12 meters above the ground with horizontal speed. It lands on the ground 5 meters from the building after 1 second. Ignore air resistance, A) How fast did you throw the ball? B) What was the ball's initial velocity? C) How fast was it ...
Tuesday, December 13, 2011 at 10:44pm by Geraldo

physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
Friday, November 4, 2011 at 12:50pm by Meagan

physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
Tuesday, October 23, 2012 at 5:15pm by John

physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
Sunday, November 4, 2012 at 8:22pm by jim

physics
A ball of volume V=8 L is full of air with pressure higher than atmospheric pressure by Δp=2×10^4 Pa. The total mass of the ball and the air inside is 200 g. The ball is tossed up to a height h=20 m, then it falls down, collides with the ground, and bounces back up. ...
Tuesday, April 30, 2013 at 5:15am by jfchfrhrc

physics
A ball of volume V=8 L is full of air with pressure higher than atmospheric pressure by Δp=2×10^4 Pa. The total mass of the ball and the air inside is 200 g. The ball is tossed up to a height h=20 m, then it falls down, collides with the ground, and bounces back up. ...
Tuesday, April 30, 2013 at 5:16am by jfchfrhrc

HS Physics
Please help...I know the direction is up, but I can't figure out the magnitude, except that its label is kg · m/s, I think. A 0.400-kg ball is dropped from rest at a point 1.80 m above the floor. The ball rebounds straight upward to a height of 0.730 m. What are the magnitude ...
Friday, October 15, 2010 at 6:22pm by Tzana

Physics
A baseball is hit with a speed of 27.0 m/s at an angle of 42.0 deg. It lands on the flat roof of a 10.0 m-tall nearby building. If the ball was hit when it was 1.0 m above the ground, what horizontal distance does it travel before it lands on the building...
Tuesday, August 2, 2011 at 10:12pm by Kyle

Physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
Friday, October 15, 2010 at 6:20pm by Jordan

Physics
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air ...
Wednesday, March 23, 2011 at 12:45pm by Jacob

Physics - Circular motion
A marble of mass m is placed on top of a bowling ball of radius r and allowed to roll from rest. derive the angle from centre of circle at which the marble loses contact with bowling ball. assume there is no friction between marble and bowling ball.
Sunday, September 5, 2010 at 2:37am by Andrew

physics 111
A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor? answer in kg·m/s
Wednesday, October 27, 2010 at 2:00pm by Blake

college physics1
Well, assuming the gravity still has a value, named "g" (although the building is infinitely tall and then its value should be zero), the velocity should be, v=-gt take t=2, and you have, v=-2g If you assume g=9.8 m/s^2, then, v=-19.6 m/s. But remember that physically there is...
Tuesday, September 10, 2013 at 8:05am by John

physics
The fist ball is thrown up ward with avelocity of 20m/s at the same instant. The second ball is dropped at 40m hight from the first ball at what time the two ball collide each other?
Tuesday, December 13, 2011 at 12:19pm by Abdu

science
If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
Thursday, February 6, 2014 at 8:28pm by kristi

college physics
A cue ball initially moving at 4.3m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s final speed is 2.3 m/s at angle 1 with respect to it's original line of motion. The 8 ball moves with unknown speed at an angle 2 unknown with ...
Thursday, March 10, 2011 at 3:28pm by sarah

Physics
1. A car starts from rest and accelerates uniformly at 3.0 m/s2. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2. How long does it take the second car to overtake the first car? 2. A ball is thrown downward from the top of a ...
Thursday, February 16, 2012 at 10:01pm by G

math
Billy kicks a soccer ball with an initial velocity of 24 ft/sec into the goal. How long was the ball in the air? If the goalie caught the ball at a height of 4 feet from the ground, how long was the ball in the air before it was caught?
Tuesday, May 14, 2013 at 11:51am by Vanessa

Physics
A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?
Thursday, October 13, 2011 at 7:08pm by Millie

physics
A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?
Thursday, October 13, 2011 at 8:38pm by Tina

Physics
A ball is thrown horizontally at 12.2 m/s from the roof of a building and lands 21.0 m from the base of the building. How high is the building?
Tuesday, September 17, 2013 at 3:52pm by Allyssa

calculus
A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in feet per...
Sunday, November 14, 2010 at 9:23pm by Ashley

Physics
You throw a ball horizontally off of a building with a horizontal velocity of 5 m/s. What's the ball horizontal velocity 8 seconds later? How high should the building be if you want the ball to fall for a total of 12 seconds?
Tuesday, June 21, 2011 at 12:13pm by Jennifer

physics
a ball is dropped from a point heiht above the ground.on striking the ball it rebounds with a small speed as it strikes with the ground and would hence come up to same height from were it was dropped and motion remained infinetly?draw x-t gaphs?
Monday, May 6, 2013 at 4:42am by lalita

physics
For the straight-up case, the ball must have travelled 25 m up and back down. A ball thrown at 40 m/s with no friction would have risen H = V^2/(2g) = 81.6 m There is no way the height of a baseball thrown up in air will be reduced from 81.6 m to 25 m by friction. This is a ...
Tuesday, November 30, 2010 at 12:19am by drwls

physics
A stone A is dropped from rest down a well, and in 1 s another stone B is dropped from rest. Determine the distance between the stones another second later. The well is 80ft deep
Wednesday, March 12, 2008 at 9:10am by shan

Calculus
A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.5 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
Sunday, November 8, 2009 at 10:18pm by Peter

trig
At 2 points 95 ft apart on a horizontal line perpendicular to the front of a building, the angles of elevation of the top of the building are 25 degrees and 16 degrees. How tall is the building?
Monday, February 14, 2011 at 5:50pm by Greg

Calculus
A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the building at a speed of 1.6 m/s, how fast is the length of his shadow on the building decreasing when he is 4 m from the building?
Sunday, February 3, 2013 at 11:47am by bryan

physics
-A person throws a ball upward into the air with an initial velocity of 15 m per second. - How could you calculate how high the ball goes and how long the ball is in the air before it comes to the thrower's hand?
Monday, July 21, 2008 at 7:21pm by ruby

Quadratic Equations
The height of an object dropped from a 100-ft-tall building is given by h=-16t squared + 100. When will the object hit the ground? (Please provide steps/explanation to solve this problem.)
Sunday, March 29, 2009 at 1:01pm by purpletree

physics
April releases a rock at rest from the top of a 40 m tower. Ignoring air resistance, what is the speed of the rock as it hits the ground? ( g = 9.8 m/s/s)
Tuesday, October 12, 2010 at 2:41pm by Anonymous

Calculus
A ball is dropped from the top of a building. The height, , of the ball above the ground (in feet) is given as a function of time, , (in seconds) by y = 1640 - 16t^2 y'= -32t When does the ball hit the ground, and how fast is it going at that time? Give your answer in feet ...
Sunday, November 14, 2010 at 10:46pm by Ashley

math
Standing on the top of a building, Eric spots his friend's car at an angle of depression of 35°. The car is 360 feet from the base of the building. How tall is the building to the nearest hundredth of a foot?
Wednesday, June 12, 2013 at 10:15am by Anonymous

Calculus
Find the maximum height of a ball thrown upward from the top of a 640 ft tall building with an initial velocity of 128 ft/s
Tuesday, February 12, 2013 at 12:44pm by Millie

physics
a ball is thrown vertically upward from the top of the building with a velocity 10m/s.it reaches the ground in 5 sec.Find the height of the building the ball strikes the ground?
Thursday, September 13, 2012 at 2:02am by p

physics
A boy throws a ball up into the air with a speed of 12.3 m/s. The ball has a mass of 0.25 kg. How much gravitational potential energy will the ball have at the top of its flight? (Assume there is no air resistance.)
Wednesday, May 29, 2013 at 10:58am by Anonymous

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