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please solve 5. (3p.) A still ball of mass 0.514kg is fastened to a cord 68.7cm long and is released when the cord is horizontal.

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5. (3p.) A still ball of mass 0.514kg is fastened to a cord 68.7cm long and is released when the cord is horizontal. At the bottom of its path, the ball strikes a 2.63kg steel block at rest on a horizontal frictionless surface. On collision, one-half the kinetic energy is converted to internal energy. Find the final speeds

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