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June 12th, 2012, 08:48 AM  #1 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  A golf ball is dropped from a height of 10 m on a fixed stee
Hi all A golf ball is dropped from a height of 10 m on a fixed steel plate. The coefficient of restitution is 0.894 . Find the height to which the ball rebounds on the fist ,second and third bounces ? 
June 12th, 2012, 09:58 AM  #2 
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: A golf ball is dropped from a height of 10 m on a fixed
The kinetic energy of the ball when it hits the ground equals the potential energy it had when it was stationary at height H. ½mv² = mgH or, dividing both sides by m: ½v² = gH At each bounce, the new speed of the ball is 0.894 times the old speed. Therefore the new kinetic energy is ½m(0.894 * v)², which at the top of the bounce (height h) will have turned into a new potential energy of mgh. ½(0.894 * v)² = gh But the lefthand side is 0.894² times ½v², which was equal to gH. Therefore: 0.894² * gH = gh Dividing both sides by g: h = 0.894² * H h = 0.799236 * H And this gives you the relationship between successive bounce heights. 
June 12th, 2012, 12:25 PM  #3 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  Re: A golf ball is dropped from a height of 10 m on a fixed
this solving for teacher I don't understand clearly can please explain step by step u1 =root(2gh) velocity of plate before and after impact u2= v2 = 0 e(u1  u2 ) =V2V1 e(root(2gh)  0 ) = ( 0  V1) V1 = e X root(2gh) V^2  u^2 = 2gh now u = zero so V1 = 2gh1 h1 = vb^2/2g h1 = e^22gh/2g h = e^2 X H (from this can find each height ) 
June 13th, 2012, 06:04 AM  #4  
Senior Member Joined: Feb 2009 From: Adelaide, Australia Posts: 1,519 Thanks: 3  Re: A golf ball is dropped from a height of 10 m on a fixed Quote:
 
June 14th, 2012, 06:43 AM  #5 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  Re: A golf ball is dropped from a height of 10 m on a fixed
u1 =root(2gh) formula for velocity after falling from height h why it not zero ,,, after falling it sould hit the second body and I don't now from where he got V^2  u^2 = 2gh 

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