A 1000 kg wrecking ball is suspended from a cable of length 8 m. The wrecking ball is released from rest at an angle of 0 = 20° below the horizontal. At the moment the ball hits the building the cable is vertical. The wall does not move appreciably the first time the ball strikes the wall. The acceleration due to gravity is g = 9.80 m/s² and the coefficient of restitution between the ball and wall is e = 0.2.

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