First slide

Gravitational potential and potential energy

Question

The curves for potential energy (U) and kinetic energy (E_k) of a two particle system are shown in figure. At what points the system will be bound?

Easy

A

Only at point D
B

Only at point A
C

At point D and A
D

At points A, B and C

Solution

The system will be bound at points where total energy is negative. In the given curve at point A, B and C, the PE is more than KE.

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