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 as shown in the figure below. A cord initially holding the blocks together is burned; after that happens, the block of mass 3m moves to the right with a speed of V3m = 2.00 m/s. M = 0.420 kg a.) Is the original energy in the spring or in the cord? Why? b.) The momentum of the system is conserved in the bursting-apart process  1b) Explain how that is possible considering there are large forces acting  2b) Explain how that is possible considering there is no motion beforehand and plenty of motion afterward?

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A: Solution is given below.

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