Q. If a force of $250\ N$ act on body, the momentum acquired is $125\ kg$-$m/s$. What is the period for which force acts on the body
A) $0.5\ sec$
B) $0.2\ sec$
C) $0.4\ sec$
D) $0.25\ sec$
Explanation
(a) Change in momentum = Impulse
$\Rightarrow \mathrm{\Delta}p = F \times \mathrm{\Delta}t \Rightarrow \frac{\mathrm{\Delta}p}{F} = \frac{125}{250} = 0.5\ \sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.