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a ball rolling on oa inclined plane dors so with constant acceleration. One ball, A, is released from rest on th etop of an inclined plane 18m long to reach the bottom 3s later. At the same time as A is released, another ball, B, is projected up the same plane with a certain initial velocity. B is to travel part way up the plane, stop, and return to the bottom so as to arrive there simultaneously with A. calculate the velocity of projection of B.

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