Physics · Force and inertia, Newton's first law of motion, momentum, Newton's second Law of motion, impulse, Newton's third Law of motion
A body is accelerated by applying a force of 30 N. The change in the momentum of
A body is accelerated by applying a force of 30 N. The change in the momentum of the body after 2 sec is?
- A. \( 7.5 \mathrm{kg}-\mathrm{m} / \mathrm{s} \)
- B. \( 30 \mathrm{kg}-\mathrm{m} / \mathrm{s} \)
- C. \( 120 \mathrm{kg}-\mathrm{m} / \mathrm{s} \)
- D. \( 60 \mathrm{kg}-\mathrm{m} / \mathrm{s} \)
Step-by-step solution
Using Newton's second law, impulse equals change in momentum: F·Δt = Δp. Given F = 30 N and Δt = 2 s, Δp = 30 × 2 = 60 kg-m/s.
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