1. Mar 2, 2010 #1

   tongtong1993

   

   1. The problem statement, all variables and given/known data
   A ball of 2kg drops from rest to ground from a height 5m and rebounds to the same height.
   If the time of duration of the impact between the ball and the ground is 0.2s
   what is the total reaction of the ground on the ball
   
   
   2. Relevant equations
   
   
   
   3. The attempt at a solution
   mgh=0.5mv^2
   2(10)(5)=1.5(2)v^2
   v=10
   F=ma
   F=2(10/0.2)
   F=100

    

   tongtong1993, Mar 2, 2010
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3. Mar 2, 2010 #2

   ehild

   

   Homework Helper

   What is the change of velocity of the ball during the impact?
   
   ehild

    

   ehild, Mar 2, 2010
4. Mar 2, 2010 #3

   tongtong1993

   

   20ms^-1??

    

   tongtong1993, Mar 2, 2010
5. Mar 3, 2010 #4

   ehild

   

   Homework Helper

   Yes, this is the magnitude of the velocity change during 0.2 s.
   
   ehild

    

   ehild, Mar 3, 2010

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