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 (a) 1/9 (b) 8/9 (c) 4/9 (d) 5/9

Fractional loss of KE of colliding body,

On substituting the values of m1 and m2, we get,

We get,

Therefore, the correct option is (b)

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