85. The pulley shown 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 coefficient of kinetic friction between block A and the tabletop is . The system is released from rest, and block B descends. Block A has mass mĄ and block B has mass m3. Use energy methods to calculate the speed of block B as a function of the distance d that it has descended.

85. The pulley shown 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 coefficient of kinetic friction between block A and the tabletop is . The system is released from rest, and block B descends. Block A has mass mĄ and block B has mass m3. Use energy methods to calculate the speed of block B as a function of the distance d that it has descended.