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Question 30272
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Laws of Motion and Friction: Momentum — Recoil MCQ

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Momentum — RecoilMediumQuestion 30272

Question

A gun (3 kg) fires a bullet (0.01 kg) at 400 m/s. The recoil speed of the gun is:
  1. A
    1.33 m/s
    Correct
  2. B
    4 m/s
  3. C
    133 m/s
  4. D
    0.01 m/s

Correct answer

1.33 m/s

Explanation

By conservation of momentum: 0 = 0.01×400 + 3×v_gun. v_gun = −4/3 = −1.33 m/s. Magnitude = 1.33 m/s.

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