Q. The time in which a force of $2\ N$ produces a change in momentum of $0.4\ kg - ms^{- 1}$ in the body is
A) $0.2\ s$
B) $0.02\ s$
C) $0.5\ s$
D) $0.05\ s$
Explanation
(a) $\overrightarrow{F} = \frac{\mathrm{\Delta}\overrightarrow{p}}{\mathrm{\Delta}t} \Rightarrow \mathrm{\Delta}t = \frac{\left| \mathrm{\Delta}\overrightarrow{p} \right|}{\left| \overrightarrow{F} \right|} = \frac{0.4}{2} = 0.2\ s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.