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A simple pendulum is supended from a peg...

A simple pendulum is supended from a peg on a verticl wall. The pendulum is pulled away from the wall to a horizontal position and releases as shown in figure `-4.152.` The ball hits the wall, the coefficient of restitution being `2//sqrt2.` What is the minimum number of collisions after which the amplitude of oscillation becomes less than `60^(@)`

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