JEE Main Physics question

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 with timeCorrect
(B)Kinetic energy of the system does not change with time
(C)Angular momentum of the system does not change with time
(D)Potential energy of the system does not change with time

Answer: (A)

Solution

Zero net external force means dP/dt = 0, so the system's total linear momentum is conserved;

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Question ID VK-152899