A system of particles is free from any external force `vec v and vec a` be the velocity and acceleration of the centre of mass, then it necessarily follows that :

A system of particles is acted upon by a constant nonzero external force. If v and a are instantaneous velocity and acceleration of the centre of mass, then it is possible that at a given instant

Let vec(v) and vec(a) denote the velocity and acceleration respectively of a body in one-dimensional motion.

A system of N particles is free from any extenal forces. (a) Which of the following is true for the magnitude of the total momentum of the system?

A system of N particles is free from any external forces Which of the following must be true for the sum of the magnitudes of the momenta of the individual particles in the system ?

Net external force acting on a system of particle is not equal to zero. If velocity and acceleration of the centre of mass of the system of particles at some instant of time are found to be v and a respectively select possible option (s).

Show that in the absence of any external force, the velocity of the centre of mass remains constant.