Body A of mass \( 4 \mathrm{~m} \) moving with speed \( u \) collides with another body \( B \) ...

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Body A of mass \( 4 \mathrm{~m} \) moving with speed \( u \) collides with another body \( B \) of mass \( 2 m \) at rest the collision is head on and elastic in nature. After the collision the fraction of energy lost by colliding body \( A \) is
[NEET 2019]
(a) \( \frac{5}{9} \)
(b) \( \frac{1}{9} \)
(c) \( \frac{8}{9} \)
(d) \( \frac{4}{9} \)
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