Two identical balls are at rest and side by side at the top of a hill. You let one ball, a, start rolling down the hill. A little later you start the second ball, b, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball b passes ball a:.
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Two identical balls are at rest and side by side at the top of a hill. You let one ball, a, start ro...
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