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Which quantity of a two particles system depend only on the separation between the two particles?

1. Kinetic energy
2. Total mechanical energy
3. Potential energy
4. Both (A) and (B)

Correct answer: Potential energy

Solution

Potential energy in a two-particle system is a function of their relative separation, because it comes from the interaction between the particles. Kinetic and total mechanical energy also depend on motion, so they are not determined only by distance.

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