The pulley in has radius R and a moment of inertia I. The rope does not slip over the pulley, and the pulley spins on a frictionless axle. The coefcient of kinetic friction between block A and the tabletop is pk. The system is released from rest, and block 3 descends. Block A has mass mA and block B has mass m3. Use energy methods to calculate the speed of block 3 as a function of the distance d that it has descended