Question: Unit of impulse is: [PMT/NEET-1997]
a. Newton
b. kg–m
c. kg–m/s
d. Joule
Answer: c. kg–m/s
Solution: Impulse
$J=\int F\,dt$
equals change in momentum, so
$[J]=[p]=\text{kg m s}^{-1}$.
Newton (kg m s$^{-2}$) times second gives kg m s$^{-1}$.
