Mechanical energy of a basketball

texasgrl05

Help! I don't understand how to do this problem:

A basketball of mass 0.50 kg is dropped from rest from a height of 1.22 m. It rebounds to a height of 0.40 m.

(a) How much mechanical energy was lost during the collision with the floor?

(b) A basketball player dribbles the ball from a height of 1.22 m by exerting a constant downward force on it for a distance of 0.13 m. In dribbling, the player compensates for the mechanical energy lost during each bounce. If the ball now returns to a height of 1.22 m, what is the magnitude of the force?

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WhirlwindMonk

1. Mechanical energy is potential energy + kinetic energy. You need to calculate the mechanical energy before and after the bounce.

2. Work = Change in KE (which = change in ME in this case)
W = Fd

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