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Question

A ball is dropped from a height of 10m. If 40% of its energy is lost in collision with the earth then after collision the ball will rebound to a height of

A
10 m
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B
8 m
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C
4 m
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D
6 m
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Solution

The correct option is D 6 m
Initial kinetic energy, 12mv21=mgh1
kinetic enrgy alter rebound = 12mv22=0.612mv21=mgh2
mgh2mgh1=0.6[12mv21]12mv21
h2=0.6h1=6m

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