1. A ball of mass 1 kg is dropped from a height of
7 m and rebounds to a height of 4.5 m. Calculate:
(a) its kinetic energy before the impact and
[Ans. 70
(b) its initial rebound velocity and kinetic energy,
[Ans. 11.8 ms and 45 J]
(c) the loss of kinetic energy.
[Ans. 15 )
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Answer:45
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