A motor supplies a constant torque or twist of M = 120 lb•ft to the drum. If the drum has...

A motor supplies a constant torque or twist of M = 120 lb•ft to the drum. If the drum has a weight of 30 lb and a radius of gyration of kO = 0.8 ft, determine the speed of the 15-lb crate A after it rises s = 4 ft starting from rest. Neglect the mass of the cord.