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Help, about repulsive force

  • #1

Homework Statement


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


Homework Equations





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
 

Answers and Replies

  • #2
ehild
Homework Helper
15,406
1,810
What is the change of velocity of the ball during the impact?

ehild
 
  • #3
20ms^-1??
 
  • #4
ehild
Homework Helper
15,406
1,810
Yes, this is the magnitude of the velocity change during 0.2 s.

ehild
 

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