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A bullet of mass \( m \) is fired from a rifle of mass M. if
\( \mathrm{P} \) \( \vec{v} \) be the velocity of the bullet, velocity acquired by

W the rifle is:
(1) \( \vec{V}=-\frac{M}{m} \vec{v} \)
(2) \( \vec{V}=-\frac{m}{M} \vec{v} \)
(3) \( \vec{V}=-\vec{v} \)
(4) \( \vec{V}=+\vec{v} \)
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