James decides to use a ball tides to stiff rod to take out Kevin. He first needs to test this idea out on a small scale. A steel ball of mass 0.500 kg is fastened to a cord that is 70.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal (see figure below). At the bottom of its path, the ball strikes a 2.50 kg steel block initially at rest on a frictionless surface. The collision is elastic. a)  Find speed of the ball just before impact. b)  Find the speed of the block just after impact.

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