If the end of the cord is subjected to a force of P = 75 lb, determine the speed of the 10...

If the end of the cord is subjected to a force of P = 75 lb, determine the speed of the 100-lb block C after P has moved a distance of 4 ft, starting from rest. Pulleys A and B are identical, each of which has a weight of 10 lb and a radius of gyration of k = 3 in. about its center of mass.