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

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

Work, Energy and Power

Solution:

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