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Q.

A body P of mass 2m moving with velocity u collides head-on with a stationary body Q of mass m. After the collision, the bodies coalesce. Then percentage loss of energy of P in the process is

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a

24.42%

b

55.55%

c

40.58%

d

62.18%

answer is B.

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Detailed Solution

Conserving momentum, (2m+m)V=2m.u⇒V=2u3Energy lost =12.2m.u2−12.2m.V212.2m.u2×100%=55.55%
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