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A bullet is fired from the rifle. If the rifle recoils freely, then the kinetic energy of the rifle is ___________

A bullet is fired from the rifle. If the rifle recoils freely, then the kinetic energy of the rifle is ___________ Correct Answer Less than the kinetic energy of the bullet

By conservation of momentum, MV = mv or V = mv/M Kinetic energy of the rifle is Kr = 1/2MV2 = 1/2M(m2 v2)/M2 Kr = m/M * Kb As m is lesser than M, Kr is lesser than Kb Thus the kinetic energy is less than that of the bullet.

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