A bullet is fired from a rifle and the rifle recoils. Kinetic energy of rifle is

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less than K.E. of bullet

greater than K.E. of bullet

equal to K.E. of bullet

none of the above

answer is A.

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Detailed Solution

Momentum of the system is conserved. Mr.vr = Mb.vb = pNow and Since Mr >> Mb, (KE)r << (KE)b

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