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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 of the colliding body A is :

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

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detailed solution

Correct option is D

Fractional loss of KE of the colliding body  A: 
KEKE=4m1m2m1+m22=44m2m4m+2m2=32m236m2=89

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