A pulley made from a disk of mass 2.4 kg and radius 0.19 m is free to rotate about its center. Masses of 7.0 kg (left side) and 3.5 kg (right side) are attached to a string that is placed on the pulley and set-up. The left-side mass is located 0.93 m above the ground. When the mass on the left side is released, the mass on the left-side (obviously) moves downward and the mass on the right side moves upward.

With what speed in meters per second does the mass on the left side hit the ground? (you may assume no loss of mechanical energy)