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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.

A cord initially holding the blocks together is burned; after this the block of mass 3M moves to the right with a speed of v1=2.48 m/s. What is the velocity of the block of mass M?

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    The force on each end of the spring is the same, the impulse is the same, the momentums are the same.

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