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 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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  • [JEE MAIN 2013]

Obtain $\tau = I\alpha $ from angular momentum of rigid body. 

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