Q.

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

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a

Less than that of the bullet

b

More than that of the bullet

c

Same as that of the bullet

d

Equal or less than that of the bullet

answer is A.

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Detailed Solution

E=P22m.  If P = constant then  E∝1mi.e. kinetic energy of heavier body will be less. As the mass of gun is more than bullet therefore it possess less kinetic energy.
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A bullet is fired from a rifle. If the rifle recoils freely, then the kinetic energy of the rifle is