A 3.0kg block rests on a horizontal tabletop. The coefficient of kinetic friction between the block and the table is 0.25. The block is attached by a light, inextensible string that passes over an ideal pulley to a 1.5kg block that hangs vertically off the edge of the table. When the system is released from rest, determine the magnitude of the acceleration of the blocks. Give your answer in m/s2.