If the resultant of all the external forces acting on a system of particles is zero, then form an inertial frame, one can surely say that

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Linear momentum of the system does not change in time

Angular momentum of the system does not change in time

Kinetic energy of the system does not change in time

Potential energy of the system does not change in time

answer is A.

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Detailed Solution

Since it is a inertial frame the Newton's laws of motion are applicable.

So when the net force is zero, the change in linear momentum must be zero.

but we cannot conclude anything about rotational motion of the body.

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