A particle of mass moving with velocity V makes head. One elastic collision with another particle of the same mass and initially at rest. The velocity of the first particle after the collision:
Correct answer: B. -V
- A. 2V
- B. -V
- C. +V
- D. Zero
Explanation
-V: This option is correct. In an elastic collision, the first particle will experience a change in direction and will have a velocity equal in magnitude but opposite in direction to its initial velocity. Therefore, the correct option is "-V" as the first particle will have a velocity equal in magnitude but opposite in direction to its initial velocity after the elastic collision.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Collisions
Collisions involve the conservation of linear momentum when bodies interact for a short time. The topic covers impulse, elastic and inelastic collisions, kinetic energy changes, and the coefficient of restitution, with calculations usually based on one dimensional motion. Momentum remains conserved in isolated collisions, but kinetic energy is conserved only in elastic collisions.
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