Identical balls are dropped from the same initial height and bounce back to half the initial height. In Case 1, the ball bounces off a cement floor, and in Case 2, the ball bounces off a piece of stretchy rubber.
1. In which case is the change in momentum of the ball between the instant just before the ball collides with the floor or rubber and the instant just after the ball leaves the floor or rubber the biggest?
a. Case 1
b. Case 2
c. Same in both
2. In which case is the average force acting on the ball during the collision the biggest?
a. Case 1
b. Case 2
c. Same in both
Answers: 2
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