Q. A boy of mass $0.25\ kg$ is projected with muzzle velocity $100\ ms^{- 1}$ from a tank of mass $100\ kg$. What is the recoil velocity of the tank
A) $5\ ms^{- 1}$
B) $25\ ms^{- 1}$
C) $0.5\ ms^{- 1}$
D) $0.25\ ms^{- 1}$
Explanation
(d) Using law of conservation of momentum, we get
$100 \times v = 0.25 \times 100 \Rightarrow v = 0.25\ m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.