First slide

Gravitaional potential energy

Question

If the net external force acting on a system of particles interacting through gravitational force is zero,

Moderate

A

Kinetic energy of the system remains conserved.
B

Kinetic energy of the system may remain conserved
C

Potential energy of the system must decrease
D

None of the above questions is correct

Solution

Since the particles are interacting with each other through gravitation force, speed of particles increase due to the influence of gravitational force of attraction. So the kinetic energy of the system increases at the expense of its gravitational potential energy.

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