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A brass door-knocker has a 0.25 kg solid ball with a radius of 11 mm attached to a thin 0.2 kg ring with a diameter

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A brass door-knocker has a 0.25 kg solid ball with a radius of 11 mm attached to a thin 0.2 kg ring with a diameter of 44 mm. The gap is d = 11 mm, and the knocker is released from rest at an angle of 0 = 80. If the coefficient of restitution is 60%, find the rebound angle. The knocker rebounds to a maximum angle of | 45 V " degrees. Round answer to 2 significant figures

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