Question

The centre of a mass of a rigid body lies

• A. inside the body
• B. outside the body
• C. neither $\left(a\right)$ nor $\left(b\right)$
• D. either $\left(a\right)$ or $\left(b\right)$

Answer 1

The correct option is D either $\left(a\right)$ or $\left(b\right)$

Centre of mass of rigid bodies may lie either inside or outside the body.

For example: COM of solid sphere lies inside it whereas COM of uniform circular ring lies at its geometric centre where there is actually no matter.