Which of the following describes an isolated system with respect to linear momentum?

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Problem

Which of the following describes an isolated system with respect to linear momentum? (a)

\text{A system in which the centre of mass remains at rest}

(b)

\text{A system in which all internal forces are absent}

(c)

\text{A system on which no net external force acts}

(d)

\text{A system that moves with a constant velocity}