In which of the following cases is angular momentum conserved? a. When the next, external torque acting on the system is zero. b. When the linear momentum is also conserved. O c. When the momentum of inertia of the rigid body is computed relative to the center-of-mass axis O d. When the rotational kinetic energy is also conserved. e. When the internal collision torques exclude friction

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.