A total of 228 ball bearings take 18 seconds to cascade onto the elastic slab resting on the scale. Each ball has mass 8.33 g. Compute the incident and rebound velocities of a ball at the slab. It rebounds to a height h 2 . It has lost some kinetic energy in hitting the scale.
Impulse is the change in momentum.
The change in momentum of the ball is mv 2 - mv 1 . Average force is impulse per unit time.