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Body A of mass 4m moving …

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Body A of mass 4m moving worh speed u collieds 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
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