Three objects with masses, m1 = 6.0 kg, m2 = 10.0 kg, and m3 = 15.

Three objects with masses, m1 = 6.0 kg, m2 = 10.0 kg, and m3 = 15.0 kg, are attached by strings over frictionless pulleys as indicated in Figure P5.32. The horizontal surface is frictionless and the system is released from rest. Using energy concepts, find the speed of m3 after it moves down 5.0 m.1 m/s