A force of 10 N acts on a body of mass 20 kg for 10 seconds. The change in its momentum is;
Correct answer: B. 100 kg-m/s
- A. 50 kg-m/s
- B. 100 kg-m/s
- C. 300 kg-m/s
- D. 1000 kg-m/s
Explanation
To find the change in momentum, use the impulse-momentum theorem: Impulse = Force x Time = Change in momentum.Here, the force applied is 10 N, and the time duration is 10 seconds. Therefore, the impulse (and hence the change in momentum) is 10 N x 10 s = 100 kg-m/s.Option B is correct because it matches this calculation. Option A (50 kg-m/s), Option C (300 kg-m/s), and Option D (1000 kg-m/s) are incorrect because they do not match the calculated change in momentum of 100 kg-m/s.
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