A system of particles is free from any external force. If v→ and a→ be the velocity and acceleration of the centre of mass, then it necessarily follows that
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a
v→=0; a→=0
b
v→≠0; a→=0
c
v→=0; a→≠0
d
both 2 and 3
answer is D.
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Detailed Solution
Absence of external force, only confirms about the fact that a→ = 0. However, v→ may or may not be zero.
A system of particles is free from any external force. If v→ and a→ be the velocity and acceleration of the centre of mass, then it necessarily follows that