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R 1982B3 A child of mass M holds onto a rope and steps off a...

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R 1982B3 A child of mass M holds onto a rope and steps off a platform Assume that the initial speed of the child is zero The rope has length R and negligible mass The initial angle of the rope with the vertical is 0 as shown in the drawing above a Using the principle of conservation of energy develop an expression for the speed of the child at the lowest point in the swing in terms of g R and cos 0 b The tension in the rope at the lowest point is 1 5 times the weight of the child Determine the value of cos 0

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