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Three perfectly elastic bodies of masses 5kg. 1kg, 5kg are arranged in that order on a...

Three perfectly elastic bodies of masses 5kg. 1kg, 5kg are arranged in that order on a straight line, and are free to move along it. Initially, the middle one is moving with velocity 27m/s. and the others are at rest. Find how many collisions take place in the subsequent motion, and verify that the final value of the kinetic energy is equal to the initial value.

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