If the external forces acting on a system have zero resultant, the centre of mass
If the external forces acting on a system have zero resultant, the centre of mass
(a) must not move
(b) must not accelerate
(c) may move
(d) may accelerate.
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(b) must not accelerate
(c) may move
Explanation:
If there is no/zero resultant force acting on a system, there will be no acceleration. Hence (b), not (d).
If it is already moving with a uniform velocity, it will continue its motion without acceleration. Hence (c), not (a).
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