A simple pendulum is hanging from a peg inserted in a vertical wall...

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A simple pendulum is hanging from a peg inserted in a vertical wall. Its bob is stretched in horizontal position from the wall and is left free to move. The bob hits on the wall the
\( \mathrm{P} \) coefficient of restitution is \( \frac{2}{\sqrt{5}} \). After how many collisions

W the amplitude of vibration will become less than \( 60^{\circ} \)
[UPSEAT 1999]
(a) 6
(b) 3
(c) 5
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