A 2 kg ball moving at 5 m/s makes a head-on elastic collision with a 2 kg ball at rest. The velocities after the collision are:

  1. v1 = 5 m/s, v2 = 2.5 m/s
  2. v1 = 0 m/s, v2 = 5 m/s
  3. v1 = 5 m/s, v2 = 0 m/s
  4. v1 = 2.5 m/s, v2 = 2.5 m/s
Answer

B) v1 = 0 m/s, v2 = 5 m/s

v1 = m1 - m2m1 + m2u1 = 0 m/s and v2 = 2m1m1 + m2u1 = 5 m/s. Check: momentum and kinetic energy are both conserved. SLO P-11-B-12 · Application

Physics MCQ · More Momentum and Collisions MCQs · Practise