Two blocks A and B, of mass 8 kg and 12 kg respectively, hang from a cable which passes over a pulley of negligible mass. Knowing that the blocks are released from rest and that the energy dissipated by the axle friction in the pulley is 10 j,
determine (a) the velocity of block B as it strikes the ground, (b) the force exerted by the cable on each of the two blocks during the motion