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Question 5423
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Laws of Motion: Conservation of Momentum MCQ

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Conservation of MomentumMediumQuestion 5423

Question

A gun (3 kg) fires a bullet (50 g) at 400 m/s. The recoil speed of the gun is:
  1. A
    2 m/s
  2. B
    4 m/s
  3. C
    20/3 m/s
    Correct
  4. D
    6 m/s

Correct answer

20/3 m/s

Explanation

Conservation of momentum: 0 = 3V + 0.05×400. 3V = −20. V = 20/3 ≈ 20/3 m/s.

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