Problem 6: A motor pulls a cable through a pulley system to raise the weight. The weight that is attached to pulley B starts from rest. A point on the cable at A moves with constant acceleration. Pulley C moves with a constant acceleration of 15 mm/s. At t 2 s, the velocity of B is 20 mm/s and the velocity of C is 30 mm/s. Determine the accelerations of the cable at A and pulley B after t = 4 seconds. C B