If the resultant of all the external forces acting on a system of particles is zero, then from a...

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If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame, one can surely say that - [IIT-JEE 2009]
(a) Linear momentum of the system does not change in time
(b) Kinetic energy of the system does not change in time
(c) Angular momentum of the system does not change in time
(d) Potential energy of the system does not change in time
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