Saturday

July 4, 2015

July 4, 2015

Number of results: 66,463

**Physics**

A 47.0-g Super Ball traveling at 29.5 m/s bounces off a brick wall and rebounds at 15.5 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 5.00 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 14, 2014 by Anonymous*

**Physics**

A tennis ball of mass 57. g bounces off a wall. Right before hitting the wall, the ball is moving to the right and up with vx=+40. m/s and vy=+10. m/s. Right after bouncing off the wall, the ball is moving to the left and up with vx=-35. m/s and vy=+10. m/s. If the ball is in ...
*October 14, 2009 by Nala*

**spelling**

I need to write about soccer. I'm not a soccer playerand I do not know anything about it. Could you give me a couple topics for paragraphs. Thanks.
*January 29, 2009 by Anya*

**phsyics**

A baseball is thrown straight up. The drag force is proportional to v^2. In terms of g, what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? In terms of g, what is the y-component of the ball's acceleration when its ...
*September 23, 2010 by jane*

**math**

ball thrown up from top of 96 foot high tower with initial velocity of 80 ft/s. when does ball reach max height and how high is it at that time?
*October 10, 2011 by BK*

**phy**

A baseball is thrown horizontally from the top of a cliff 50 meters up. The initial velocity of the ball is 10 m/s. How far from the base of the cliff will the ball land?
*March 5, 2014 by Anonymous*

**Physics**

A 0.350-kg ball is dropped from rest at a point 1.10 m above the floor. The ball rebounds straight upward to a height of 0.420 m. Taking the negative direction to be downward, what is the impulse of the net force applied to the ball during the collision with the floor?
*January 3, 2012 by Robert*

**physics**

when roy is holding the ball, it has a GPE of 5J.then when he throw the ball straight up it has 6J ofGPE and24J KE. a)before throwing the ball GPE=_____ KE=___ TE=____ b) as he realse the ball Gpe=__ KE___ TE=____ c) How much work did Roy do when he threw the ball d) At the ...
*May 31, 2012 by lisa*

**Physics**

A motor of a certain elevator gives it a constant upward acceleration of 0.767 m/s2, the elevator starts from rest, accelerates for 2s, then continues with a constant speed. a) What is his final speed after 2s? b) Calculate speed after 1 ,and 3 s.? c) How far has it risen 1,2,...
*October 2, 2014 by John*

**Algebra II**

Help me with this, please... A ball is dropped vertically from a height of 80 meters. After each bounce, the ball reaches a maximum height equal to 60 percent of maximum height of the previous bounce. a. Write the first three terms of the sequence. Explain how you know what ...
*April 10, 2014 by Me and I*

**physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 4.5m away horizontally at a height of 1m above the point of release. What is the required initial speed?
*October 8, 2010 by applebottom*

**physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?
*September 27, 2014 by anna*

**Algebra 1**

A ball is thrown into the air with the in initial upward velocity of 60 ft/s. It's height (h) in feet after t seconds is given by the function h=- -16t^2+60t+6. What will the height be at t=3 seconds?
*February 11, 2015 by Steve*

**Physics**

A small plane flying horizontally 150m above the ground at a constant speed of 120km/h is to drop a container with supplies to a point on the ground. How far from the point directly above the target should the supplies be dropped without giving them an initial push?
*September 24, 2012 by Lext*

**physics**

starting from rest, a ball rolss, down an incline ata constant acceleration of 2meters per second what is the velocity of the ball after 8.5 seconds? how far does the ball roll in 10 seconds? any one can help pleasse im stuck
*January 13, 2008 by ashley*

**physics**

A tennis ball with a velocity of +9.6 m/s to the right is thrown perpendicularly at a wall. After striking the wall, the ball rebounds in the opposite direction with a velocity of -5.8 m/s (to the left). If the ball is in contact with the wall for 0.013 s, what is the average ...
*October 6, 2012 by Mackenzie *

**physics.**

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s. Part 2: Find the ...
*October 25, 2010 by Autumn*

**Physics**

Velocity/instantaneous velocity question? In a demonstration a ball falls directly to the ground. Which of the following statements about this event is not correct? (Assume downward is the positive direction.) a)The average velocity during the first half of the fall is greater...
*October 7, 2012 by Lewis*

**Physics - Projectile Motion**

A ball rolls horizontally off the edge of a tabletop that is 1.60 m high. It strikes the floor at a point 1.58 m horizontally away from the table edge. (Neglect air resistance.) (a) How long was the ball in the air? ___ s (b) What was its speed at the instant it left the table...
*February 1, 2007 by TechnoBoi11*

**physics**

A ball is rolling on a table and leaves the end side of the table with a velocity of 1.5 m/s. The table is 0.70 m high and the ball has a mass of 0.850 kg. What's the speed of the ball when it hits the ground? What equation should I use?
*October 12, 2014 by Richard*

**Physics**

A 5.6 kg ball (I=2/3mr^2) starts on a hill 11.3 m above level surface of the ground. The ball then rolls (without slipping) down the hill. What is the linear speed of the ball when it reaches the bottom of the hill?
*March 17, 2015 by Sarah*

**Physics - stuck**

Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. The initial distance between them is 168m. Find when and where the cars will pass one another and their speeds as they are passing. ...
*February 18, 2008 by Anonymous*

**CHEMISTRY**

Suppose that 30.0 mL of 0.20 M C6H5COO(aq) is titrated with 0.30 M KOH(aq). a) What is the initial pH of the 0.20 M C6H5COOH(aq)? b) What is the pH after the addition of 15.0 mL of 0.30 M KOH(aq)? c) What volume of 0.30 M KOH(aq) is required to reach halfway to the ...
*September 29, 2011 by Sarah*

**PHYSICS**

2 pool balls of equal mass experience a perfectly elastic head on collision. 1 ball is traveling at 2m/s and the other at 3m/s in the opposite direction.What is thier speed just after impact? I know the balls swap speed and change direction but can't find the correct formula ...
*March 23, 2011 by mark*

**physics**

problem says that a cannon ball is fired at a 30 degree angle off a 10 meter high wall at 80 m/s. Use work and energy to find it's impact speed. I worked out this out with the equation: (1/2)(mass)(initial velocity)^2 + mgy = (1/2)(mass) (final velocity)^2 + mg(y final) i got ...
*November 9, 2010 by Taylor*

**math**

1.A ball is dropped from a height of 2.0, to a floor. After each bounce, the ball rises to 63% of its previous height What is the total vertical distance the ball has travelled after 5 bounces? 2.An oil produces 25000 barrels of oil durign its first month of production. ...
*November 2, 2008 by Steph*

**Physics**

A golfer hits a golf ball at an angle of 35° above horizontal. If the initial velocity is 55 m/s, how long does the ball soar before it hits the ground?
*December 1, 2010 by Elaina*

**physics**

the force acts on a 50g ball varies with time.if the initial velocity of the particles is 20m/s.what is the average acceleration of ball during this time?
*January 8, 2012 by jumana*

**physics**

the force acts on a 50g ball varies with time.if the initial velocity of the particles is 20m/s.what is the average acceleration of ball during this time?
*January 8, 2012 by jumana*

**physics**

the force acts on a 50g ball varies with time.if the initial velocity of the particles is 20m/s.what is the average acceleration of ball during this time?
*January 8, 2012 by jumana*

**physics**

You stand at the edge of a cliff, holding a ball out over the edge. You give the ball an initial velocity of 7.00 m/s straight up, releasing the ball when it is 17.0 m above ground level (the level of the ground at the base of the cliff). Use g = 10.0 m/s2, and neglect air ...
*September 15, 2014 by Hannah*

**Physics**

I have a quick question, If a ballplayer catches a ball 3.0s after throwing it vertically upward. With what speed did he throw it, and what height did it reach?
*September 13, 2010 by Jenna*

**physics**

Sam tosses a ball horizontally off a footbridge at 3.2 m/s. How much time passes after he releases it until its speed doubles?
*December 20, 2010 by dan*

**physics**

Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
*December 22, 2010 by sk*

**physics**

Sam tosses a ball horizontally off a footbridge at 4.8 m/s. How much time passes after he releases it until its speed doubles?
*February 25, 2013 by Anonymous*

**physics**

A ball of mass m is projected with a speed u at an angle theta with horizontol. Find the change in momentum after time t and when it reaches the ground
*July 9, 2014 by ak!@#$%^&a*

**physics**

A stationary pool ball with mass 0.20 kg is struck with an average force of 35 N over a time of 18 ms. What speed does it have just after impact?
*May 27, 2015 by andrew*

**physics**

A ball is thrown straight up with an initial speed of 60 m/s. How high does it go? Assume the acceleration of gravity is 10 m/s 2 . Answer in units of m 010 (part 2 of 2) 10.0 points How long is it in the air? Answer in units of s
*October 22, 2012 by Anonymous*

**physics**

8. A pitcher throws a baseball off a 20m high cliff into a canyon at 30degrees above the horizon at an initial velocity of 35m/s. How far will the ball travel horizontally from the pitcher? Assume no air resistance. 9. How high will the ball get from the bottom of a canyon? 10...
*October 19, 2011 by teresa*

**Physics**

A ball of mass oscillates on a spring with spring constant = 200 . The ball's position is described by (0.350 ) 16.0 with measured in seconds. -What is the amplitude of the ball's motion? -What is the frequency of the ball's motion? -What is the value of the mass ? - Ronald ...
*April 28, 2010 by R*

**Physics- science**

An automobile with an initial speed of 4.82 m/s accelerates uniformly at the rate of 2.2 m/s2. Find the displacement of the car after 5.9 s. Answer in units of m
*September 13, 2011 by Destiny*

**science **

a 150 gram bullet is fired with a speed of 50 ms if it is stopped after hitting a target 101 meters away what is its initial KE
*December 11, 2014 by edi wow*

**Physics**

A kickoff sends a football with an initial velocity of 25 m/s at an angle of 50 degrees above the horizontal. a) find the x and y components of the velocity b) find the time the ball is in the air c) find the horizontal distance the ball travels before hitting the ground d) ...
*November 29, 2012 by Annie*

**physics 101**

A 51.5-g Super Ball traveling at 29.0 m/s bounces off a brick wall and rebounds at 19.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.60 ms, what is the magnitude of the average acceleration of the ball during this time interval?
*September 7, 2011 by Anonymous*

**Physics**

A 50.0 g Super Ball traveling at 27.0 m/s bounces off a brick wall and rebounds at 17.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 4.00 ms, what is the magnitude of the average acceleration of the ball during this time interval? (...
*January 24, 2013 by Robert *

**physics**

A 52.5g super ball traveling at 28.0m/s bounces off a brick wall and rebounds at 18.5m/s. A high speed camera records this event. If the ball is in contact with the wall for 4.10ms, what is the magnitude of the average acceleration of the ball during this time interval?
*February 4, 2013 by george*

**Physics Part 2**

Rick's next shot isn't as good. She hits the cue ball with a velocity of 5.6 m/s and it hits the 4 ball. The cue ball bounces off at a 45 degree angle off it's original path at a speed of 3.5 m/s. What is the velocity of the 4 ball? ---So all i know is the momentum before is...
*November 10, 2013 by CC*

**History - Italy**

What is the history of the Italian sports of soccer and football. Is Italian football the same as American soccer? If so, what is Italian soccer? Thanks for your help.
*March 18, 2012 by Jade*

**physics**

a superball of mass .125 kg is dropped onto a concrete floor from a height of 1m it bounces back at a height of .9m. What is the net force acting on the ball before and after its released? Work done by the net force while the ball is falling until just before it hits the floor...
*October 1, 2011 by kate*

**physics**

A mass M = 0.464 kg moves with an initial speed v = 2.98 m/s on a level frictionless air track. The mass is initially a distance D = 0.250 m away from a spring with k = 844 N/m, which is mounted rigidly at one end of the air track. The mass compresses the spring a maximum ...
*March 24, 2012 by bob please help*

**Math( help please ! )**

The height of a ball thrown vertically upward from a rooftop is modelled by h(t)=-5t^2=20t=50, where h(t) is the ball's height above the gorund,in meters, at time t seconds after the throw a) determine the maximum height of the ball b) how long does it take for the ball to ...
*October 17, 2011 by Erin*

**Math( help please ! )**

The height of a ball thrown vertically upward from a rooftop is modelled by y=-5t^2+20t+50 , where h(t) is the ball's height above the ground , in meters , at time t seconds after the throw a) Determine the max height of the ball b) how long does it take for the ball to reach ...
*October 17, 2011 by Melissa*

**physics**

A typical baseball has mass of 150 grams. Suppose a batter hits a fastball pitched to him at 92 mph (which is about 40.89 m/s). After contact, the ball's speed is measured as 104 mph (which is about 46.22 m/s) directly back at the pitcher (who is able to duck out of the way, ...
*May 12, 2013 by Anonymous*

**algebra**

A student threw a ball directly upward from the balcony of a building. The height of the ball as measured from the ground "t" seconds after it was thrown, is given by the expression h= -16t(2nd power) + 64t + 768 When does the ball reach the ground?
*September 14, 2009 by Pat*

**algebra**

A ball has been hit with an initial velocity of 24.5 m/sec from a height of 5.375 meters off the ground. Write an equation that models the height of the ball.
*January 5, 2011 by Holly*

**physics**

A golf ball is drive. With an initial velocity of 25 m/s at an angle of 35 degrees with the horizontal find the maximum height the ball reaches above its original height
*November 9, 2011 by Anthony*

**physics**

A 0.23 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s.Find the momentum of the ball of dough halfway to its maximum height on the way up.
*March 15, 2012 by Chris*

**Pre-Calc/Trig...**

A ball is thrown upward with an initial velocity of 4ft/sec from a height of ten feet. what is the maximum height that the ball will reach. h(t)= -16+vt+s
*October 15, 2014 by Anonymous*

**Physics**

In a game of pool the cue ball strikes another ball of the same mass and initially at rest. After the collision the cue ball moves at 3.50 m/s along a line making an angle of 22 degrees with its original direction of motion. and the second ball had a speed of 2 m/s. a)What is ...
*March 6, 2007 by Nat*

**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*

**Physics - Projectile Motion**

During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42deg above the horizontal, giving it an initial velocity of 15m/s. If the ball is 5.3m above the level of the playing field when you throw ...
*August 19, 2010 by Shaila*

**physics**

A ball launched from ground level lands 2.15 s later on a level field 50 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ignore any effects due to air resistance.)
*August 25, 2011 by yelya*

**physics**

A ball launched from ground level lands 3 s later on a level field 48 m away from the launch point. Find the magnitude of the initial velocity vector and the angle it is above the horizontal. (Ignore any effects due to air resistance.)
*September 28, 2011 by rob*

**Physics **

How high does the 35g ball go if the ball leaves the spring at the point shown in image? K=953 N/m and Xa=0 and Xb=0.120m (b)? What is the velocity of the ball when it leaves the spring?
*March 26, 2012 by bobby*

**Physics**

A player is shooting the basketball 10 meters from the hoop. He releases the ball when it is 2 meters above the floor, with an initial velocity of 12 m/s at an angle of 65 degrees. ( the basketball hoop is also 3m above the ground) How long does it take for the ball to reach ...
*October 18, 2009 by Jill*

**Algebra**

A ball is thrown upward with an initial velocity of 14 meters per second from a cliff that is high. The height of the ball is given by the quadratic equation where h is in meters and t is the time in seconds since the ball was thrown. Find the time that the ball will be 30 ...
*March 4, 2013 by Sherry*

**Ap physics**

A football is kicked at ground level with a speed of 10.0 m/s at an angle of 37.0° to the horizontal. How much later does it hit the ground?
*September 10, 2010 by rayray*

**Ap physics**

A football is kicked at ground level with a speed of 10.0 m/s at an angle of 37.0° to the horizontal. How much later does it hit the ground?
*September 10, 2010 by rayray*

**Physics **

A football is kicked at ground level with a speed of 20.7 m/s at an angle of 34.6° to the horizontal. How much later does it hit the ground?
*February 5, 2012 by Stella *

**physics**

A football is kicked at ground level with a speed of 15.4 m/s at an angle of 34.7° to the horizontal. How much later does it hit the ground? (in s)
*January 21, 2015 by Tanner*

**English**

1. Playing computer games in not good for your health. You may have some problems on your eyes. (Do we have to use 'on' or 'in' before 'eyes'?) 2. The boy is planting a tree. He is adding some soil around the tree. 3. The boys are playing soccer in the mountain. One is kicking...
*March 23, 2015 by rfvv*

**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...
*October 31, 2008 by Sam*

**physics**

A ball is thrown vertically upward with a speed of 27.9 m/s from a height of 1.9 m. How long does it take to reach its high- est point? The acceleration of gravity is 9.81 m/s2. Answer in units of s
*September 28, 2011 by rc*

**physics**

a 0.60 kgparticle has a speed og 2.0m/s at point A and a kineticenergy at point B. What is it's kinetic energy at point A ? What is its speed ?
*September 13, 2014 by sarry*

**Physics**

During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42° above the horizontal, giving it an initial velocity of 15 m/s. If the ball is 5.3 m above the level of the playing field when you throw ...
*October 5, 2014 by Han*

**physics**

When a 1.50 kg block is 3.96 m above the base of the hill, the mass has a speed of 1.71 m/s. When the block reaches a point 0.750 m above the base of the hill, what is its kinetic energy?
*November 30, 2014 by Steve*

**physics**

If the height of the water slide in the figure below is h1 = 1.55 m and h2 = 1.35 m, and the person's initial speed at point A is 0.593 m/s, at what location does the swimmer splash down in the pool?
*March 4, 2012 by Ashley*

**physics**

An electron with initial speed = 2.54×10^7 m/s is traveling parallel to an electric field of magnitude = 1.66×10^4 N/C . How much time will elapse before it returns to its starting point?
*February 21, 2013 by Steve*

**physics**

A dart is thrown horizontally with an initial speed of 6 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, vertically below P, 0.29 s later. Neglect air resistance. (a) What is the distance PQ? (b) How far away from the dart board is the dart ...
*October 22, 2010 by Connie*

**Physics**

Alexis Farias realizes her dream to play golf on the moon. She hits a golf ball with an initial velocity of 23.5m/s at an angle of 35.0 degrees above the horizontal. The acceleration due to gravity on the moon is 1.67m/s^2. A). How long is the golf ball in the air? B). How far...
*October 31, 2014 by Taylor*

**Physics**

Will you check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12 kg A 1-...
*October 14, 2007 by Soly*

**physics**

Will check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) / (4m/s) =12 kg A 1-kg ...
*October 15, 2007 by Soly*

**Physics**

A cart of mass M1 = 4.00 kg and initial speed = 4.00 m/s collides head on with a second cart of mass M2 = 2.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision. i keep getting the wrong answer please help me.I dont know what equation...
*March 6, 2008 by josh g*

**Physics**

Would someone please show me a way to work this out A ball is dropped from the top of a building 150 m high. (Ignore air resistance) A. How long does it take the ball to hit the ground? B. What is the speed of the ball when it hits the ground?
*September 13, 2011 by missy*

**Physics**

In a quality control test a steel ball with mass M falls a distance of H and bounces off a steel plate and through a hole in the wall into the ok bucket. If the ball bounces up a distance of 9/10H after hitting that plate and has a velocity of Vo at point A what is the height...
*November 14, 2012 by Ami*

**science**

if you have a 343 J of kinetic energy at the lowest point of a pendulum's swing and at the highest point has a height of 5 m what is the pendulum's mass
*February 11, 2011 by Lex*

**Physics**

A ball is thrown straight up, when it reaches the maximum height x, a second identical ball is thrown up with the same initial velocity as the first one. Where will these balls meet.
*September 11, 2013 by John*

**Physics**

A ball is thrown straight up, when it reaches the maximum height x, a second identical ball is thrown up with the same initial velocity as the first one. Where will these balls meet.
*September 11, 2013 by John*

**physics intro**

A 0.175-lb ball is thrown upward with an initial velocity of 75.0 ft/s. What is the maximum height reached by the ball? Would I need to set it up like √2*75.0*-32.2/0/175?
*October 27, 2014 by Jay*

**chemistry (college final)**

How to determine which of the compounds will have the lowest boiling point vs the highest boiling point?
*May 1, 2011 by Sarah (C)*

**physics**

A PARTICLE OF MASS M IS SHOT WITH an initial velocity v making an angle b with the horizontal,the particle moves in the gravitational field of the earth. find the angular momentum of the particle about the origin when the particle is at the origin ,at the highest point of its ...
*August 22, 2013 by mechanics*

**physical**

A basketball player who is 2.0m tall is standing on the floor 10.0m from the basket,If he shoots the ball at a 40.0¤ angle witi the horizontal,at what initial speed must he throw so that it goes through the hoop without striking the backboard?The basket height is 3.05 m.
*March 22, 2013 by yenebeb*

**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**

The target is to be dropped from the point A at t = 0, the same moment as the gun is ﬁred. The bullet hits the target at a point P. Let the initial speed of the bullet be v0 = 106 m/s, let the angle between the vector v0 and the horizontal (x) direction be θ = 57.3...
*September 30, 2011 by Jimmy*

**Physics**

If a ball is thrown directly upwards with twice the initial speed of another, how much higher will it be at its apex? A) 8 times D) 2 times B) 4 times E) 2 times C) 2 2 times Please show any equations that are used :)
*April 7, 2012 by DCM*

**physics**

Ball A is dropped from the top of a building of height h at the same instant that ball B is thrown vertically upward from the ground. When the balls collide, they are moving in opposite directions, and the speed of A is twice the speed of B. At what height does the collision ...
*August 9, 2014 by Danielle*

**physics**

2) A diving platform or diving tower has three platforms at 10 m, 7.5 m, and 5.0 m. Some students are going to drop or throw straight down identical balls from each platform and they want the balls to reach the water with the same velocity. The ball from the highest platform ...
*June 11, 2015 by julio*

**math **

If you have a graph 15 students like b-ball 10 like soccer and 5 like softball Write a ratio and solve the poblem
*November 7, 2010 by Jill*

**phusics**

A ball is thrown vertically upward from top of a building with speed of 20m/s. On the way back ball misses the building and lands on the ground. Total time the ball is in air is 6 seconds. Determine the height of the building.
*February 14, 2011 by mark matat*

**Chemistry**

Which has the highest, second highest, third highest, and lowest boiling points? 1.0.20 m MnSO4 2.9.6E-2 m Al2(SO4)3 3.8.4E-2 m Al2(SO4)3 4. 0.45 m Sucrose(nonelectrolyte) [I know it is m times i but not sure how to get "i"]
*May 13, 2015 by Jack*