Question

A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is $1.5m{s}^{-1}$, what is the final momentum of the pistol?

• A. $10kgm{s}^{-1}$
• B. $2.5kgm{s}^{-1}$
• C. $1.5kgm{s}^{-1}$
• D. $2.25kgm{s}^{-1}$

Answer 1

The correct option is D $2.25kgm{s}^{-1}$

Given, recoil velocity of the pistol, $v=1.5m{s}^{-1}$ and mass of the pistol, $m=1.5kg$
Let 'p' be the final momentum of the pistol.
We know, $p=m\times v$ $=1.5\times 1.5=2.25kgm{s}^{-1}$

Therefore, final momentum of the pistol is $2.25kgm{s}^{-1}$