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Conservation of momentum in a collision between particles can be understood from

1. Conservation of energy
2. Newton's first law only
3. Newton's second law only.
4. Both Newton's second and third law.

Correct answer: Both Newton's second and third law.

Solution

Momentum conservation in a collision follows from Newton’s second law written for each particle and Newton’s third law for the interaction forces. The internal forces are equal and opposite, so the total momentum of the two-particle system does not change.

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