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Asked by ashutosharnold1998 | 18 Apr, 2020, 12:14: PM
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Answer :- Velocity of centre of mass will vary, if the net external force acting on the system of particles is zero
 
(a) Momentum of the system will not vary .
         If it varies , velocity will vary for constant mass. This is not possible without external force
 
(b) Kinetic energy of  the system will not vary .
        If it varies , velocity will vary for constant mass. This is not possible without external force
 
(d) Position of centre of mass will not vary in absence of external forces.
Answered by Thiyagarajan K | 18 Apr, 2020, 12:41: PM

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