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Law of Conservation of Energy

A ball falls ...

Question

A ball falls from a height of 10 m. On rebounding, it loses 30% energy. The ball goes upto a height of

A

5 m

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B

7 m

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C

6 m

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D

8 m

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Solution

The correct option is B 7 m
By conserving energy
Energy at highest point will be only potential energy.
So $m g 10 - 0.3 (m g 10) = m g h_{f}$ $=> h_{f} = 7 m .$

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