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If external forces acting on system have zero resultant, then the centre of mass

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Must not accelerate

May accelerate

Must not move

May move

answer is A, D.

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Detailed Solution

${\vec{F}}_{c m} = 0 {\vec{a}}_{c m} = 0$

So,

C.M may be at rest (or) C.M may be in uniform motion.

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