5. Two blocks of masses m and 3m are placed on a frictionless, horizontal surface. A light spring is attached to the more massive block, and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned; after that happens, the block of mass 3m moves to the right with a speed of2.00 m/s. (a) What is the velocity ofthe block of mass m? (b) Find the system's original .5 3'_\"'.L." ' ' elastic potential energy, taking 111 = 0.350 kg. (c) Is the original energy in the MM spring or in the cord? (d) Explain your answer to part lit'lisl'v m J m (c). (e) Is the momentum of the system conserved in the bursting-apart process? Explain how that is possible considering there are large forces acting and there is no motion before-hand and plenty of motion afterward