Question

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

Easy

Solution

$E = \frac{P^{2}}{2 m} .$ If P = constant then $E \propto \frac{1}{m}$
i.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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