Why is it advised to tie any luggage kept on the roof of a bus with a rope?

Explanation

To understand why it is advised to tie luggage kept on the roof of a bus with a rope, we can analyze the situation using the concept of inertia and Newton's laws of motion.

### Step-by-Step Solution:

1. **Understanding Inertia**:
- Inertia is the property of an object to remain at rest or in uniform motion unless acted upon by an external force. This means that if an object is moving, it will continue to move at the same speed and in the same direction unless something stops it.

**Hint**: Remember that inertia is the reason why objects resist changes in their state of motion.
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