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A ball is thown horizontally from a train station platform directly into the path of a...

A ball is thown horizontally from a train station platform directly into the path of a huge locomotive traveling in the opposite direction. Assume the ball strikes the front of the locomotive at a perfectly flat and vertical location. Also assume the initial velocities of the ball and locomotive relative to the observer standing on the train station platform are 4.3 m/s and 86 m/s respectively. Determine the speed of the tennis ball relative to the observer standing on the station platform in m/s if the colllision is (a) perfectly elastic and  (b) perfectly plastic and (c) if the coefficient of restitution of collision is 0.65 .
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