Question

A body of mass $2kg$ moves with an acceleration $3m{s}^{-2}$. The change in momentum in one second is

• A. $\frac{2}{3}kg$ $m{s}^{-1}$
• B. $\frac{3}{2}kg$ $m{s}^{-1}$
• C. $6kg$ $m{s}^{-1}$
• D. None of these

Answer 1

The correct option is C $6kg$ $m{s}^{-1}$

Mass of the body, $m=2kg$
Acceleration of the body, $a=3m/s^2$
$\therefore$ Force, $F=ma=2\left(3\right)=6kgm/s^2=6N$
But Force is rate of change of momentum. Therefore, change in momentum in one second is $6kgm/s^2$