Centre of mass of a body is ……… at which………….is………… .

Explanation

To solve the question regarding the center of mass of a body, we can break it down into a step-by-step explanation.

### Step-by-Step Solution:

1. **Understanding the Concept of Center of Mass**:
- The center of mass (COM) of a body is a specific point where the mass of the body can be considered to be concentrated. This point is crucial in analyzing the motion of the body.

2. **Filling in the Blanks**:
...