Question

A body of mass $20Kg$ moves with an acceleration of $2m{s}^{-2}$ . the rate of change of momentum in S.I units is:

• A. $40Kgm{s}^{-2}$
• B. $10Kgm{s}^{-2}$
• C. $4Kgm{s}^{-2}$
• D. $1Kgm{s}^{-2}$

Answer 1

The correct option is A

$40Kgm{s}^{-2}$

Explanation for correct option

(A) $40Kgm{s}^{-2}$

Step 1: Given data

Mass = $20Kg$ , acceleration = $2m{s}^{-2}$

Step 2: Finding momentum'

Formula: Force = Mass × acceleration

Now, enter the value in the formula below.

Force = $20kg\times 2m{s}^{-2}$

= $40Kgm{s}^{-2}$

According to Newton's second law, force is equal to the rate of change in momentum.

Hence the rate of change in momentum is $40Kgm{s}^{-2}$. Hence option (a) is correct.