What do you mean by inertia

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Inertia**: Inertia is the property of matter that causes it to resist changes in its state of motion. This means that an object at rest will stay at rest, and an object in motion will continue in motion at a constant velocity unless acted upon by an external force.

2. **Inertia of Rest**: This refers to the tendency of an object that is at rest to remain at rest. For example, if a bus that is stationary suddenly starts moving, a person inside the bus will feel as if they are being pushed backward. This happens because their body was at rest and wants to remain at rest, while the bus moves forward.

3. **Inertia of Motion**: This refers to the tendency of an object that is in motion to continue moving in the same direction at the same speed. For instance, if a moving car suddenly stops, the passengers inside will lurch forward. This occurs because their bodies were in motion and want to continue moving forward, even though the car has stopped.

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