# Body A of mass 4m moving with speed u collides with another body B of mass 2m, at rest.

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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) $1\over9$

(2) $8\over9$

(3) $4\over9$

(4) $5\over9$
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Work energy and power, collision in two dimensions