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Question

A body of mass 20 kg moves with an acceleration of 2 m/s2. The rate of change of momentum in SI unit is:

A
10
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B
4
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C
1
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D
40
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Solution

The correct option is D 40
Given:
Mass of the body, m = 20 kg
Acceleration, a = 2 m/s2
Using Newton's second law of motion, force equals rate of change of momentum.
F=Δp/Δt
For a body of constant mass,
F = ma
So, rate of change of momentum is:
Δp/Δt= ma.
Δp/Δt= 20 kg ×2 m/s2
Δp/Δt= 40 N.

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