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# If the external forces acting on a system have zero resultant , the center of mass

$\begin{array}{1 1} \text{a) must not move} \\ \text{b) must move}\\ \text{c) must not accelerate} \\\text{d) may accelerate} \end{array}$

$\overrightarrow{F}_{ext}=M \overrightarrow{a}_{cm}$
If $\overrightarrow{F}_{ext}=0=> \overrightarrow {a}_{cm}=0$
It must not accelerate
edited Jun 16, 2014