An athlete does not come to rest immedietly after crossing the winning line due to the

Options

A. Inertia of rest
B. Inertai of motion
C. Inertia of direction
D. None of these

Answer

To solve the question regarding why an athlete does not come to rest immediately after crossing the winning line, we can analyze the concept of inertia in physics.

### Step-by-Step Solution:

1. **Understanding Inertia**: Inertia is the property of an object to resist changes in its state of motion. It means that an object in motion will continue to move unless acted upon by an external force.

2. **Scenario of the Athlete**: When the athlete is running towards the winning line, they have a certain momentum due to their speed. This momentum is a product of their mass and velocity.

3. **Crossing the Winning Line**: As the athlete crosses the winning line, they are still in motion. Their body has not yet come to a stop, and they possess a significant amount of kinetic energy.

4. **Effect of Inertia of Motion**: The athlete's inertia of motion means that they will continue to move forward even after crossing the line. This is because there is no immediate force acting on them to bring them to a stop.

5. **Potential Consequences of Stopping Abruptly**: If the athlete were to try to stop immediately after crossing the line, they would risk losing balance and potentially falling. This is due to the inertia that keeps them moving forward.

6. **Conclusion**: Therefore, the reason the athlete does not come to rest immediately after crossing the winning line is due to the inertia of motion.

### Final Answer:
The correct option is **B) Inertia of motion**.