A 4 kg rifle fires a 0.02 kg bullet at 400 m/s. The recoil speed of the rifle is:

  1. 1 m/s
  2. 4 m/s
  3. 2 m/s
  4. 20 m/s
Answer

C) 2 m/s

Total momentum stays zero: MV = mv Rightarrow V = 0.02 4004 = 2 m/s (backwards). SLO P-11-B-11 · Application

Physics MCQ · More Momentum and Collisions MCQs · Practise