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NDA 2024 GAT · General Knowledge · Motion, Forces and Gravitation · hard

A constant force of 10 N acts on a body of mass 2 kg, initially at rest, for 3 s. The momentum gained by the body is

Single correct option

A constant force of 10 N acts on a body of mass 2 kg, initially at rest, for 3 s. The momentum gained by the body is
  1. A. 15 kg m/s
  2. B. 30 kg m/s
  3. C. 60 kg m/s
  4. D. 5 kg m/s
Show answer and solution

Answer: (B) 30 kg m/s

Impulse equals the change in momentum, so Δp = F × t = 10 × 3 = 30 kg m/s. The mass is not needed for the momentum, although it fixes the speed (15 m/s). The trap is 15, which is the final speed and not the momentum, and 60, which uses the mass wrongly.
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Original question written in the NDA 2024 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake