Question: Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the

Two blocks of masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them (Fig. P9.4). A cord initially holding the blocks together is burned; after this, the block of mass 3M moves to the right with a speed of 2.00 m/s.
(a) What is the speed of the block of mass M?
(b) Find the original elastic potential energy in the spring if M = 0.350 kg

Two blocks of masses M and 3M are placed

3M Before 2.00 m/s 3M After Figure P9.4

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