Q. A gun fires a bullet of mass $50\ g$ with a velocity of $30m\sec^{- 1}$. Because of this the gun is pushed back with a velocity of $1m\sec^{- 1}$. The mass of the gun is
A) $15\ kg$
B) $30\ kg$
C) $1.5\ kg$
D) $20\ kg$
Explanation
(c) $m_{G} = \frac{m_{B}v_{B}}{v_{G}} = \frac{50 \times 10^{- 3} \times 30}{1} = 1.5\ kg$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.