If the resultant of all external forces is zero, then velocity of centre of mass will be
zero
constant
either (a) or (b)
neither (a) nor (b)
A
neither (a) nor (b)
B
constant
C
either (a) or (b)
D
zero
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Solution
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The correct option is B constant Fexternal=MaCM where M is the total mass.
Zero net external force implies that aCM=0
Thus VCM=constant OR zero
(If the system is at rest initially, then VCM=0)
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