Friday

October 21, 2016
Number of results: 59,009

**physics**

A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway is 1.6 seconds. Find the time it takes for the ball to fall from rest all the way to the ground.

*September 16, 2008 by nj*

**physics**

A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 4.36 s. Find the time it takes for the ball to fall from rest all the way to the ground.

*February 7, 2011 by shaknocka*

**physics**

A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.4 s. Find the time it takes for the ball to fall from rest all the way to the ground.

*October 3, 2011 by Anonymous*

**physics**

A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fail halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground. Can anyone give me some hints to do this? ...

*October 6, 2007 by ajo*

**Physics**

a crane holds a 500kg wrecking ball in place using a wire with tension T1 and is horizontal to the ground. The crane swings it with a cable under tension T2. if the wire holds the ball in place so the cable forms a 20 degree angle with the vertical, determine tensions T1 and T2.

*November 15, 2015 by Drew*

**science**

A building is being demolished with a wrecking ball. I want to cross the street where it is swinging without risking being hit.If the cable attached to wrecking ball 20 meters long do i have to cross if i start as soon as the wrecking ball and cable are straight up and down

*October 23, 2015 by Anonymous*

**PHYSICS**

A 1250 KG wrecking ball is lifted to a height of 12.7 m above its resting point . When the wrecking ball is released, its swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. A) What is the potential energy of the wrecking ball at a height of 12...

*January 22, 2015 by Jon*

**physics**

A 6840 N wrecking ball hangs from the end of a steel cable. What is the net force acting on the wrecking ball if the cable snaps? equation please and explain

*October 13, 2010 by Bansnoob*

**Physics**

A 1200 wrecking ball hangs from a 20 -long cable. The ball is pulled back until the cable makes an angle of 30.0 with the vertical.By how much has the gravitational potential energy of the ball changed?

*April 16, 2011 by Mike aloe*

**physics**

A 1100 wrecking ball hangs from a 10 -long cable. The ball is pulled back until the cable makes an angle of 28.0 with the vertical.By how much has the gravitational potential energy of the ball changed?

*January 28, 2013 by Mak*

**physics**

a 1100 kg wrecking ball hangs from a16m long cable. the ball is pulled back until the cable makes an angle of 17 with the vertical. By how much has the gravitational potential energy of the ball changed?

*November 26, 2012 by kelly *

** college physics**

A 1100 kg wrecking ball hangs from a 14m-long cable. The ball is pulled back until the cable makes an angle of 17.0 degrees with the vertical.By how much has the gravitational potential energy of the ball changed?

*June 22, 2011 by Bethany*

**Pre-Calc**

A wrecking ball attached to a crane swings back and forth. The distance that the ball moves to the left and right of its resting position with respect to time is represented by the following graph.

*November 15, 2013 by lisa*

**physic**

A 1250 kg wrecking ball is lifted to a height of 12.7 m above its resting point. When the wrecking ball is released, it swings toward an abandoned building and makes an indentation of 43.7 cm in the wall. a. What is the potential energy of the wrecking ball at a height of 12....

*December 18, 2014 by wellington*

**MATH HELP**

A soccer ball is kicked toward the goal. The height of the ball is modeled by the function h(t) = −16t2 + 48t where t equals the time in seconds and h(t) represents the height of the ball at time t seconds. What is the axis of symmetry, and what does it represent? t = 1....

*February 15, 2016 by Oscar*

**algebra**

A soccer ball is kicked toward the goal. The height of the ball is modeled by the function h(t) = −16t2 + 48t where t equals the time in seconds and h(t) represents the height of the ball at time t seconds. What is the axis of symmetry, and what does it represent? t = 1....

*April 27, 2016 by anon*

**college physics**

A 1500 wrecking ball hangs from a 16 -long cable. The ball is pulled back until the cable makes an angle of 23.0 with the vertical.

*February 16, 2012 by stew*

**physics**

A ball is thrown horizontally at 10.0 m/s from the top of a hill 50.0 m high. How far from the base of the hill would the ball hit the ground? I don't understand the following explained by Quittich (sp)? "Since there is no vertical component, the time to hit the ground is the ...

*April 2, 2008 by Jon*

**PHYSICS**

A ball thrown horizontally with speed vi = 26.0m/s travels a horizontal distance of d = 60.0m before hitting the ground. From what height h was the ball thrown? Which I got this answer below. h= 26.1 m How do I solve for the one below. If it takes a ball dropped from rest 2....

*February 5, 2015 by Iris PHYS*

**Math**

A ball is dropped from a height of 36 feet. The quadratic equation d=1/2 gt^2 is used to calculate the distance (d) the ball has fallen after t seconds. The constant g is the acceleration of gravity, 9.8m/s^2. How long does it take the ball to hit the ground? A ball in problem...

*November 19, 2012 by Lux*

**Physics**

A ball, dropped from rest, cover 2/7 of the distant to the ground in the last 2 seconds of its fall. From what height was the ball dropped? What was the total time of the fall?

*October 11, 2009 by Robert C*

**physics**

a ball is thrown straight up with a speed of 8.0 m/s from a third-floor window located 13.0 m above ground. Calculate the maximum height, measured from the ground, of the ball; calculate the ball's velocity when it reaches the ground, and calculate the total time it takes the ...

*October 13, 2014 by Arleen *

**physics**

You stand at the top of a cliff while your friend stands on the ground below you. You drop a ball from rest and see that it takes 0.90 for the ball to hit the ground below. Your friend then picks up the ball and throws it up to you, such that it just comes to rest in your hand...

*January 30, 2011 by SAM*

**Physics, please help**

Hello, I don't know how about to answering this question: work out the problem of a ball of mass m that falls a distance h from rest. It hits the floor and rebounds to its starting height. (a) What total time ie required for the motion? (Neglect the time of contact with the ...

*October 31, 2006 by amber*

**Maths**

A ball is dropped from height of 100 feet towards the ground. It hits the ground and bounces back 80% of the fall. This continues till the ball comes to rest. Find the vertical distance covered by the ball

*July 22, 2016 by Dog love*

**Physics**

A cart of mass m (including the mass of the crane) has a pendulum hanging from a crane attached to the cart. There is no friction due to the normal force, u = 0, or wheel bearings of the cart wheels. The cart is experiencing and applied force to the left of 10N. The ball at ...

*October 12, 2014 by Robert*

**PHYSICS!!**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.386 m. The plane of the circle is 1.10 m above the ground. The string breaks and the ball lands 2.00 m (horizontally) away from the point on the ground directly beneath the ball's location when ...

*November 1, 2008 by mike*

**Physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.300m. The plane of the circle is 1.19m above the ground. The string breaks and the ball lands 1.91m (horizontally) away from the point on the ground directly beneath the ball's location when the...

*September 18, 2015 by Lash*

**physics**

The average velocity for a trip has a positive value. Is it possible for the instantaneous velocity at any point during the trip to have a negative value? (I'm thinking yes because derivatives can be negative but I'm not sure). also A ball is dropped from rest from the top of ...

*January 2, 2009 by Anonymous*

**Algebra 1 Answer Evaluation**

The height of a soccer ball kicked from the ground can be approximated by the function h = =16t^2 + 64t, where he is the height in feet and t is the time in seconds. Find the time it takes for the ball to return to the ground. A: It takes the ball 2 seconds to return to the ...

*May 13, 2014 by Victoria*

**Physics **

A ball on the end of a string is whirled around in a horizontal circle of radius 0.486 m. The plane of the circle is 1.83 m above the ground. The string breaks and the ball lands 2.39 m away from the point on the ground directly beneath the ball’s location when the string ...

*January 28, 2013 by Emily*

**Physics **

A ball on the end of a string is whirled around in a horizontal circle of radius 0.486 m. The plane of the circle is 1.83 m above the ground. The string breaks and the ball lands 2.39 m away from the point on the ground directly beneath the ball’s location when the string ...

*January 28, 2013 by Allisa *

**Physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.33 m. The plane of the circle is 1.21 m above the ground. The string breaks and the ball lands 2.22 m away from the point on the ground directly beneath the ball’s location when the string ...

*March 12, 2013 by Mike Undi*

**physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.33 m. The plane of the circle is 1.26 m above the ground. The string breaks and the ball lands 2.4 m away from the point on the ground directly beneath the ball’s location when the string breaks...

*October 5, 2014 by cd*

**physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.467 m. The plane of the circle is 1.24 m above the ground. The string breaks and the ball lands 2.49 m away from the point on the ground directly beneath the ball’s location when the string ...

*October 5, 2014 by Joan*

**Physics**

The Colliding Balls: A ball is released from rest at a height h above the ground. The ball collides with the ground and bounces up at 75% of the impact speed the ball had with the ground. The collision with the ground is nearly instantaneously. A second ball is released above ...

*November 20, 2012 by Zalak*

**physics**

A 0.400 kg ball is shot directly upward at initial speed 40.0 m/s. What is its angular momentum about a point 2.0 m horizontal from the launch point, when the ball is a) at maximum height and b) halfway back to the ground? What is the torque on the ball about the point 2m from...

*June 13, 2009 by jane*

**Physics**

a student sees a ball fall from the third floor of a building and notes that it takes 2.50 s for the ball to fall the last half of the way to the ground. What is the height of the building?

*September 20, 2015 by Liselotte*

**physics**

A ball rolls along a desktop with an uniform velocity of 3 m/s. What is the displacement after 10 seconds have passed? A ball is thrown upward with an initial velocity of 18 m/s? What is the maximum height the ball reaches if the ball is assumed to leave from the ground? &#...

*November 8, 2011 by kim*

**physics**

A ball rolls along a desktop with an uniform velocity of 3 m/s. What is the displacement after 10 seconds have passed? A ball is thrown upward with an initial velocity of 18 m/s? What is the maximum height the ball reaches if the ball is assumed to leave from the ground? &#...

*November 8, 2011 by kim*

**Physics**

Ball A is attached to a string of length l=13.4 m and is released from rest. Ball B is released from rest and falls straight down. Which of the following statements for what happens at point P are correct, and which are incorrect? Explain your reasoning and state what is wrong...

*March 16, 2016 by Supansa*

**physics : HELP PLEASE**

A ball rolls along a desktop with an uniform velocity of 3 m/s. What is the displacement after 10 seconds have passed? A ball is thrown upward with an initial velocity of 18 m/s? What is the maximum height the ball reaches if the ball is assumed to leave from the ground? &#...

*November 8, 2011 by kim*

**physics : HELP PLEASE**

A ball rolls along a desktop with an uniform velocity of 3 m/s. What is the displacement after 10 seconds have passed? A ball is thrown upward with an initial velocity of 18 m/s? What is the maximum height the ball reaches if the ball is assumed to leave from the ground? &#...

*November 8, 2011 by kim*

**physics**

A ball on the end of a string is whirled around in a horizontal circle of radius 0.22 m. The plane of the circle is 1.69 m above the ground. The string breaks and the ball lands 2.68 m away from the point on the ground directly beneath the ball’s location when the string ...

*September 9, 2011 by squires*

**Physics**

How long does it take for a golf ball to fall from rest for a distance of 11.2 m? How far would the ball fall in twice that time?

*February 2, 2010 by Alec*

**Physics**

A ball is dropped from rest and takes 0.43 s to fall to the floor. At what height was the ball released?

*September 7, 2015 by Anonymous*

**physics**

a ball of mass 100g is projected vertically upwards from the ground with a velocity of 49m/s at the same time another identical ball is dropped from a height of 98m to fall freely along the same path as followed by the first ball. After some time the two balls collide and ...

*February 4, 2016 by gudygudy*

**Physics**

It takes 2.5 s for a small ball released from rest from a tall building to reach the ground. The mass of the ball is 0.05 kg. Calculate the height from which the ball is released. Ok so I have the time, initial velocity, and the acceleration. But the mass totally throws me off...

*October 9, 2007 by Lindsay*

**physics**

One man hold a 3kg iron ball fall from 1.5m in the air. The ball then fall on to a table .The table is 0.5m tall. The ball bound up 3cm up and fall again. What is the impact(in Newton) the ball hit the table on the first time?

*July 21, 2012 by lim*

**physics**

(a) How long does it take for a golf ball to fall from rest for a distance of 12.5 m?in seconds (b) How far would the ball fall in twice that time?in meters

*February 7, 2010 by Eunice*

**Math**

A ball is thrown 16 m into the air. The ball falls, rebounds to half its previous height, and falls again. If the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the sixth time.

*May 24, 2014 by Han*

**Math-**

A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 a.) at what time will the ball strike the ground b.) for what time t is the ball more than 128 feet above ...

*March 25, 2012 by danielle*

**Physics**

Ball A is thrown upward from the top of a building and takes 12 s to hit the ground. Ball B is thrown downward with the same speed as Ball A and takes 7 s to hit the ground. How long does it take for ball A to reach it peak?

*September 12, 2015 by Kendra*

**cal**

A ball is thrown directly upward from ground level with an initial velocity v(0) = 96 ft=s. Assuming that the ball’s only acceleration is that due to gravity (i.e., a(t) = ��32 ft=s2), determine the maximum height reached by the ball and the time it takes to ...

*May 3, 2011 by fcv*

**Physics**

Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the ground at the n-th click, in metres, be h_n...

*July 3, 2014 by Ahsanur*

**Pre-Calculus**

A ball is thrown vertically upward with an initial velocity of 64 feet per second. The distance(in feet) of the ball from the ground after t seconds is s=64t-16t. At what time will the ball strike the ground? For what time t is the ball more than 28 feet above the ground. The ...

*November 23, 2012 by Cicley*

**Physics**

A ball is thrown with initial velocity Vo=20.0 m/s from the top of a 50.0m tall building. Find the velocity Vg with which the ball strikes the ground. Find time Ttotal it takes for the ball to move to the ground.

*July 10, 2011 by Myyke*

**Precalculos**

A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is S(t)=96t-16t^2. At what time t will the ball strike the ground? For what time t is the ball more than 96 feet above the ...

*September 21, 2015 by Marcela*

**Calc**

A ball is thrown straight up from the top of a 200 foot building with an initial velocity of 40feet/second. acceleration due to gravity is -32feet/second. a) find a formula for the height of the ball at time t. b) how high does the ball rise before it begins to fall c) when ...

*May 5, 2015 by Jason*

**physics **

A ball is dropped from rest at the top of a 5.89-m-tall building, falls straight downward, collides inelastically with the ground, and bounces back. The ball loses 5.34% of its kinetic energy every time it collides with the ground. How many bounces can the ball make and still ...

*October 12, 2014 by S*

**Physics**

A ball is thrown upward and allow to fall under the influence of gravity. We will ignore the effects of air resistance. We consider three times: Time A, when the ball is first thrown upward, Time B when the ball reaches the peak, and Time C when the ball hits the ground. Rank ...

*June 18, 2011 by Casey *

**Math Algebra**

Here the missing Infos ;-)). The Physics of Baseball by Robert Adair - after t seconds, starting 1 sec after 35 angle, rotating with an initial backspin of 2000 revolutions per minute, and hit about 110mph is given by H(t)= -80t^2+340t-260 (in feet) a)how many seconds ...

*February 3, 2013 by Kat*

**Physics**

A ball is thrown horizontally from the building roof at a speed of 20 m/s. Takes ball 4 seconds to reach the ground. How tall is building? What is the ball’s speed and direction as it contacts the ground? How far from the base of the building does the ball land? Use ...

*July 11, 2016 by Bobby*

**Physics**

a wrecking ball weighing 2500 N hangs from a cable. Prior to swinging, it is pulled back to a 20 angle by a second, horizontal cable. What is the tension in the horizontal cable? We recently started these problems, and I still am so lost with them. Sorry about the lack of work...

*October 17, 2016 by Allyson*

**physics**

A ball is thrown horizontally off the edge of a cliff with an initial speed of 20.4 m/s. (a) How long does it take for the ball to fall to the ground 20.3 m below? 1 s (b) How long would it take for the ball to reach the ground if it were dropped from rest off the cliff edge? ...

*February 16, 2012 by Anonymous*

**physics**

A wrecking ball (weight 4140 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2550 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32 degrees, and ...

*June 9, 2007 by annie*

**physics**

A ball bearing is dropped from rest at a point A. At the instant it passes a mark 4.5 m below A, another ball bearing is released from rest from a position 5.5 m below A. 1) At what time after its release will the second ball bearing be overtaken by the first? 2) How far does ...

*June 7, 2011 by tank*

**physics**

A ball is projected upward at time t = 0.0 s, from a point on a roof 40 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 15.4m/s. Consider all quantities as positive in the upward direction. The time when the ball ...

*May 13, 2015 by Ahmad*

**Math**

A bowling ball is dropped from a bridge, and it takes 7 seconds to hit the ground. How far did the bowling ball fall?

*January 20, 2013 by Justin*

**Physics**

If a ball were to fall off a 180cm table,how fast would it be going halfway to the ground?

*March 4, 2012 by Anonymous*

**algebra 1 NEED NOW!!! PLEASE HELPPP**

The height of a soccer ball that is kicked from the ground can be approximated by the function: y = -12⋅x2 + 48⋅x where y is the height of the soccer ball in feet x seconds after it is kicked. Find the time it takes the soccer ball to reach its maximum height: ...

*July 1, 2013 by lisa*

**algebra 1 NEED NOW!!! PLEASE HELPPP**

The height of a soccer ball that is kicked from the ground can be approximated by the function: y = -12⋅x^2 + 48⋅x where y is the height of the soccer ball in feet x seconds after it is kicked. Find the time it takes the soccer ball to reach its maximum height: ...

*July 1, 2013 by lisa*

**Physics**

Bill throws a tennis ball vertically upward such that it leaves his hand with a speed of 12 m/s. Bill catches the ball at the same height from which he released it. Assume that air resistance is negligible, so the tennis ball can be considered to be in free-fall, with an ...

*September 12, 2014 by Danielle*

**Physics**

A ball is projected upward at time t= 0.0s, from a point on the roof 10m above the ground. The ball rises, then falls until it strikes the ground. The initial velocity of the ball is 58.5 m/s. At time t=5.97s, what is the approximate velocity of the ball? Neglect air resistance.

*March 22, 2013 by Renay*

**physics**

1.In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.56 x 10*-17 N during the first 1.87 cm of tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen. Find the speed of the ...

*September 24, 2008 by Sandhya*

**physics**

A student drops a ball from the top of a tall building; the ball takes 2.4 to reach the ground. What was the ball’s speed just before hitting the ground? (this is excluding everything like air resistance, etc)

*September 3, 2010 by Brittany*

**Physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 8.0 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...

*September 6, 2014 by John*

**Physics**

A ball is dropped from a height of 20 m. You can use the relation between the work done by gravity and the change in the ball's kinetic energy to determine the speed of the ball at any point in its free fall. The speed of the ball when it hits the ground =

*February 4, 2014 by Jennifer Tailbow*

**Physics**

A 3.79 kg ball is dropped from the roof of a building 163.8 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 11.5 N on the ball. It takes 5.77 second to hit the ground. How far from the building does the ball hit the ground? Answer in ...

*December 17, 2010 by Sangita*

**Physics**

A 4.0 kg mud ball drops from rest at a height of 12 m. If the impact between the ball and the ground lasts 0.30 s, what is the average net force exerted by the ball on the ground?

*December 29, 2011 by Anonymous*

**Physics**

A metal ball of mass 2kg is allowed to fall freely from rest from height of 5m. Calculate potential energy it possesses and kinetic energy before it reaches the ground. What happens to mechanical energy of the ball after it hits the ground?

*February 2, 2016 by Angela*

**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

*October 2, 2011 by Anonymous*

**Physics (Classical Mechanics)**

Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the groundat the n-th click, in metres, be h_n. ...

*July 4, 2014 by Ahsanur*

**math**

A steel ball is dropped from rest from the roof of a building. An observer standing behind a window that is part way down the building 120 cm high notes the ball takes 0.125 s to fall from the top to the bottom of the window. The ball continues to fall, makes an elastic ...

*September 8, 2012 by A*

**Physics Honors**

A pool ball leaves a 0.60 meter high table with an initial velocity of 2.4 m/s. Predict the time required for the pool ball to fall to the ground and the horizontal distance between the table's edge and the ball's landing location.

*October 23, 2011 by Allison*

**physics**

A ball of mass 0.1 kg, initially at rest, is dropped from height of 1 m. Ball hits the ground and bounces off the ground. Upon impact with the ground, its velocity reduces by 20%. The height (in m) to which the ball will rise is:

*June 4, 2016 by Gulab*

**preparation**

a ball of mass .1kg initially at rest is dropped from height of 1 meter.ball hits the ground and bounces off the ground.upon impact with the ground its velocity reduces by 20%.the height to which the ball will rise is?

*May 30, 2016 by rajan*

**Physics**

Two students are on a balcony a distance h above the S street. One student throws a ball vertically downward at a speed vi ; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of vi, g, h, and t. (a...

*March 31, 2016 by Anonymous*

**Physics**

A football is kicked from the ground at 27 m/s at an angle of 42 degrees above the horizontal (ground). No one gets in the way until after it hits the ground. Use the value g=9.8 m/s^2. Assuming that the ground is level and that there is negligible air resistance, wind, etc. a...

*October 27, 2010 by Sandy*

**Physics**

A football is kicked from the ground at 27 m/s at an angle of 42 degrees above the horizontal (ground). No one gets in the way until after it hits the ground. Use the value g=9.8 m/s^2. Assuming that the ground is level and that there is negligible air resistance, wind, etc. a...

*October 27, 2010 by Sandy*

**ap physics**

a ball 1 is thrown horizontally from the top of a building that is 50 meters tall. if another ball 2 is dropped at the same time as the first is released, which ball will hit the ground first? A. ball 1 B. ball 2 c. they land at the same D. depends of the initial velocity of ...

*October 31, 2015 by Anonymous*

**Physics**

a ball dropped from rest bag by a little boy from window of a three storey apartment how far has it fallen fter 3s What is the ball's velocity after 4 second of fall How far does ball fall during the lst 4 second?

*August 11, 2014 by Dulce*

**Physics**

A crane with a movable pulley system on a horizontal arm is moving a large container. The 355 kg container is hanging from a cable that is 6.15 m out on the 7.50 m arm. The arm has a mass of 345 kg. A cable that is attached to its end makes and angle 32.0 degrees with the ...

*April 7, 2013 by Bella*

**Algebra**

A ball is thrown into the air. The height in feet of the ball can be modeled by the equation h = -16t2 + 20t + 6 where t is the time in seconds, the ball is in the air. When will the ball hit the ground? How high will the ball go?

*June 2, 2014 by Selena*

**physics**

A ball starts at the origin from rest rolling down a hill. It takes seven seconds for the ball to reach point “A”, which is 25 meters from the origin. At point “B”, the ball’s velocity is 15 m/s. You may assume constant acceleration. a. What is the acceleration of the ball? [2...

*September 24, 2013 by Sue*

**Physics**

Two balls are connected by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.45 kg and is held 0.74 m above the ground. Ball 2 has a mass of 5.7 kg and is held 0.88 m above the ground. When the balls are released, ball 2 falls to the ground, ...

*December 21, 2008 by jason*

**physic**

Two balls are conneted by a string that stretches over a massless, frictionless pulley. Ball 1 has a mass of 0.81 kg and is held 0.5 m above the ground. Ball 2 has a mass of 6.3 kg and is held 0.28 m above the ground. When the balls are released, ball 2 falls to the ground, ...

*January 15, 2012 by Anonymous*

**physics**

a ball is dropped off a 20m high building, the ball weights 5 g. how long does it take to hit the ground and what is the instaneous speed of the the ball at each second of it's fall?

*October 17, 2010 by m,ary*

**Physics**

A crane is lowering two boxes downward at a constant velocity. The cable from the crane is attached directly to the upper box, m1, which has a mass of 95kg and a second cable hanging from the upper box supports the lower box, m2, which has a mass of 140kg. Determine the ...

*October 30, 2014 by Joan*

**physics**

A student drops a ball from the top of a tall building; the ball takes 2.8 s to reach the ground. 1. what was the ball's speed just before hitting the ground? 2. What is the height of the building? help please?

*October 24, 2009 by Fefe*