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Q.

A steel ball is released from a height of 27 m onto a fixed horizontal steel plate. On bouncing the ball rises to a height of 3 m. Then co-efficient of restitution is

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a

1/6

b

1/5

c

1/4

d

1/3

answer is D.

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Detailed Solution

Just before impact, u=2gHJust after impact, vertically upward velocity V=2gh∴ C=Vu=hH=327=13
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