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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:
A
$\frac{1}{9}$
B
$\frac{8}{9}$
C
$\frac{4}{9}$
D
$\frac{5}{9}$