If net external torque, about a point, acting on the system is zero, then we can surely say : (A...

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If net external torque, about a point, acting on the system is zero, then we can surely say :
(A) Kinetic energy of the system remains constant
(B) Mechanical energy of the system remains constant
(C) Torque of Internal forces is zero
(D) Momentum of system will remain constant
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