You must use energy conservation to solve this question. Two masses, m1 = 9.0 kg and m2 = 3.1 kg are connected by a light (massless) string that passes over a frictionless pulley, as shown in the figure. The system is released from rest while m2 is sitting on the floor and m1 sits a distance h = 5.4 m above the floor. At what speed will m1 be traveling just before it hits the ground?