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Block Attached to Spring

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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 (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 1.50 m/s.

(a) What is the speed of the block of mass M? m/s

(b) Find the original elastic potential energy in the spring if M = 0.400 kg.

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Solution Summary

A block attached to a spring on a frictionless horizontal surface is analyzed. The speed of the block and original elastic potential energy is determined.

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