Two masses (m = 6 kg and m = 3 kg) hang down a pulley of mass M = 2 kg and radius R = 0.3 m through a massless string. When the lighter mass (m2) is on the ground the heavier mass (m) is at a height h = 12 m. The system is released from rest. (/pulley = MR). Take gravitational acceleration as g = 10 m/s. a) Find the tensions in the string. b) Find the speed of the masses as they pass through each other. M, R m1 h m