Question

A body of mass 20 kg moves with an acceleration of 2 $m/s^2$. The rate of change of momentum in SI unit is:

• A. 10
• B. 4
• C. 1
• D. 40

Answer 1

The correct option is D 40

Given:
Mass of the body, m = 20 kg
Acceleration, a = 2 $m/s^2$
Using Newton's second law of motion, force equals rate of change of momentum.
$F=\Delta p/\Delta t$
For a body of constant mass,
F = ma
So, rate of change of momentum is:
$\Delta p/\Delta t$= ma.
$\Delta p/\Delta t$= 20 kg $\times$2 $m/s^2$
$\Delta p/\Delta t$= 40 N.