For calculating the moment of inertia of a body can we assume the whole mass of the body to be concentrated at its centre of mass ?

Explanation

To determine whether we can assume the whole mass of a body to be concentrated at its center of mass for calculating the moment of inertia, we need to analyze the concept of moment of inertia itself.

### Step-by-Step Solution:

1. **Understanding Moment of Inertia**:
- The moment of inertia (I) of a body about a given axis is defined as the sum of the products of the mass elements (dm) of the body and the square of their distances (r) from the axis of rotation. Mathematically, it is expressed as:
\[
I = \int r^2 \, dm
...