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A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when:

1. U(x) > E
2. U(x) < E
3. U(x) = 0
4. U(x) ≤ E

Correct answer: U(x) ≤ E

Solution

The motion of a particle is restricted to regions where its total energy E is greater than or equal to the potential energy U(x), as the remaining energy is kinetic. If U(x) > E, the particle cannot exist in that region.

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