From arod fixed on a vertical wall, a simple pendulum is suspended. Its bob is pulled away from the wall to a horizontal position and then released. If the coefficient of restitution is 2/sqrt(5), what would be the minimum number of impacts of the bob with the wall, after which the amplitude of the pendulum becomes less than 60^@?

From arod fixed on a vertical wall, a simple pendulum is suspended. It

1.	From arod fixed on a vertical wall, a simple pendulum is suspended. Its bob is pulled away from the wall to a horizontal position and then released. If the coefficient of restitution is 2/sqrt(5), what would be the minimum number of impacts of the bob with the wall, after which the amplitude of the pendulum becomes less than 60^@?
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