Q.

A ball is released from a height of 20m. If it loses 60% of its energy on hitting the ground, the height to which it bounces is

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a

7.5m

b

8 m

c

9 m

d

6m

answer is B.

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Detailed Solution

20−h220=60100 20−h2=12⇒h2=8m
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A ball is released from a height of 20m. If it loses 60% of its energy on hitting the ground, the height to which it bounces is