(12.196)-The motor at C pulls in the cable with an acceleration ac = (3t^2)m/s^2,where t is in seconds. The motor at D draws in its cable at aD = 5m/s^2 . If both motors start at the same instant from rest when d = 3m, determine (a) the time needed for d =0 , and (b) the velocities of blocks A and B when this occurs.
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