In a perfectly elastic collision:
Correct answer: D. Momentum, kinetic energy, and total energy are all conserved.
- A. Only momentum is conserved
- B. Only total energy is conserved
- C. Only kinetic energy is conserved
- D. Momentum, kinetic energy, and total energy are all conserved.
Explanation
In such collisions, not only is momentum conserved, but the kinetic energy and total energy of the system also remain constant before and after the collision, making it a special case of collision behavior.
This question appeared on the NUMS 2023 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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