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Q.

A simple pendulum is hanging from a peg inserted in a vertical wall. Its bob is stretched to horizontal position from wall and is left free to move, the bob hits the wall. If coefficient of restitution is 2/√5. After how many collisions the amplitude of vibration will become less than 600.

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a

6

b

3

c

5

d

4

answer is B.

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Detailed Solution

hn=he2n=h[1−cos⁡60]e2n=12⇒252n=12

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A simple pendulum is hanging from a peg inserted in a vertical wall. Its bob is stretched to horizontal position from wall and is left free to move, the bob hits the wall. If coefficient of restitution is 2/√5. After how many collisions the amplitude of vibration will become less than 600.