[-/3 Points] DETAILS Two blocks are connected by a light string that passes over a frictionless pulley as in the figure below. The system is released from rest while m, is on the floor and m, Is a distance h above the floor. A (a) Assuming m, > m2, find an expression for the speed of m, just as It reaches the floor. (Use any variable or symbol stated above along with the following as necessary: g.) (b) Taking m, = 6.8 kg, m, = 4.0 kg, and h = 3.4 m, evaluate your answer to part (a). m/s (c) Find the speed of each block when m, has fallen a distance of 1.5 m. m/s