Question: A 15-lb block B is at rest and a spring of constant k = 72 lb/in. is held compressed 3 in. by a cord. After

A 15-lb block B is at rest and a spring of constant k = 72 lb/in. is held compressed 3 in. by a cord. After 5-lb block A is placed against the end of the spring, the cord is cut causing A and B to move. Neglecting friction, determine the velocities of blocks A and B immediately after A leaves B.

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