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Thus, the system in translational motion is equivalent to a point mass (equal to the whole of mass of the system) located at the C.M. This is the reason why the whole mass of the system is considered as being concentrated at the C.M.
From eqn (6) we get,
3.1 Dynamics of a particle
3.2 Dynamics of a system of particles
3.3 Law of Conservation of Momentum