Question

The time, in which a force of $2N$ produces a change as the momentum of $0.4kgm{s}^{-1}$ in the body whose mass is $1kg$ is :

• A. $0.2s$
• B. $0.02s$
• C. $0.5s$
• D. $0.05s$

Answer 1

Answer: (A)

$0.2s$

According to newton's second equation of motion-

$F=\frac{\Delta P}{t}$

$F$: External force

$\Delta P$: Change in the momentum

$t$: Time taken

$\Rightarrow 2=\frac{0.4-0}{t}$

$\Rightarrow t=\frac{0.4}{2}$

$\Rightarrow t=0.2s$