At the bottom of its path the ball strikes a 3.80 kg steel, Ask an Expert

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A steel ball of mass 0.400 kg is fastened to a cord 75.0 cm long and fixed at the far end. It is released when the cord is horizontal. At the bottom of its path, the ball strikes a 3.80 kg steel block initially at rest on a frictionless surface. The collision is elastic. Find the speed of the ball just after the collision?

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