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Q.

If external force acting on system is zero, then

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An Intiative by Sri Chaitanya

a

CM is in un accelerated state

b

CM must accelerate

c

CM must remain at rest

d

CM must be in motion

answer is B.

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Detailed Solution

Because $F_{net} = 0$

$F = \frac{dp}{dt}$

$m. \frac{dv}{dt} = 0$

$v = const$

$i.e. a = 0$

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