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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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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