Testing Tennis Balls Tennis balls are tested by being dropped from a height of 2

Question

Testing Tennis Balls Tennis balls are tested by being dropped from a height of 2.5m onto a concrete floor. The 57g ball hits the ground, compresses, then rebounds. A ball will be accepted for play if it rebounds to a height of about 1.4m ; it will be rejected if the bounce height is much more or much less than this.

Consider the sequence of energy transformations in the bounce. When the dropped ball is motionless on the floor, compressed, and ready to rebound, most of the energy is in the form of

a kinetic energy.
b gravitational potential energy.
c thermal energy.
d elastic potential energy.

Explanation / Answer

The ball moves at v=sqrt(2gh) just before hitting the floor [Use v^2 - u^2=2gh) v= sqrt( 2*9.8*2.5) = 7 m/s (downwards)

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