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  4. In a head on elastic collision of a very heavy body moving at V with a light body at rest, velocity of heavy body after collision is

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Q. In a head on elastic collision of a very heavy body moving at $V$ with a light body at rest, velocity of heavy body after collision is

J & K CETJ & K CET 2006

Solution:

In a perfectly elastic collision the relative velocity remains unchanged in magnitude but reversed in direction. Therefore, velocity of heavy body after collision is $V$.