Momentum is always conserved in a collision of a closed system because:

  1. gravity acts
  2. the bodies are elastic
  3. kinetic energy is conserved
  4. the forces between the bodies are equal and opposite (Newton's third law)
Answer

D) the forces between the bodies are equal and opposite (Newton's third law)

Internal impulses cancel. SLO P-11-B-13 · Application

Physics MCQ · More Momentum and Collisions MCQs · Practise