Two blocks having masses 3m and m, respectively, are connected by a cable and hung across a pulley as shown in (Eigure 2). The pulley is a solid disk of mass M and radius R and rotates on a frictionless axle. Find the speed of the masses when the larger block hits the ground. Assume that the cable does not slip on the pulley. Express your answer in terms of some, all, or none of the variables m, M, R and h, and the acceleration due to gravity g.

Two blocks having masses 3m and m, respectively, are connected by a cable and hung across a pulley as shown in (Eigure 2). The pulley is a solid disk of mass M and radius R and rotates on a frictionless axle. Find the speed of the masses when the larger block hits the ground. Assume that the cable does not slip on the pulley. Express your answer in terms of some, all, or none of the variables m, M, R and h, and the acceleration due to gravity g.