Question
Is it necessary that there be mass at centre of mass?
Solution
No, the centre of mass may or may not lie within the body. i.e., it may be possible that at the position of the centre of mass there is no mass.
For e.g. in the case of a ring, the centre of mass is at the centre and there is no mass of ring at the centre of a ring.
For e.g. in the case of a ring, the centre of mass is at the centre and there is no mass of ring at the centre of a ring.
