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Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest. The collision is head on and elastic in nature. After the collision the fraction of energy lost by the colliding body A is:

1. 1/9
2. 8/9
3. 4/9
4. 5/9

Correct answer: 8/9

Solution

In a head-on elastic collision, the fraction of energy lost by body A can be calculated using the formula for energy transfer in elastic collisions. For masses 4m and 2m, the fraction of energy lost by A is 8/9.

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