posted by lucy .
Two blocks of mass m1 = 1.0 kg and m2 = 2.5 kg are connected by a massless string. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.40. Calculate the speed of the blocks after they have moved a distance 72 cm. Assume that the pulley is massless and frictionless. ( m1 is on the surface and m2 is hanging from the pulley)