The centre of mass of a system is best described as the point:

That is always the geometric centre of the body
That is equidistant from all constituent particles
Where the entire mass of the system can be considered to be concentrated for purposes of translational motion
That always serves as the origin of the reference frame

Correct answer: Where the entire mass of the system can be considered to be concentrated for purposes of translational motion

Solution

The centre of mass is the point at which the whole mass of a system may be treated as concentrated for translational motion. It need not coincide with the geometric centre or be equidistant from all particles.

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