A tennis ball and a cricket ball, both are stationary. To start motion in them :

Options

A. a less force is required for the cricket ball than for the tennis ball
B. a less force is required for the tennis ball than for the cricket ball
C. same force is required for both the balls
D. nothing can be said.

Explanation

To solve the question about starting motion in a tennis ball and a cricket ball, we will analyze the forces required to overcome their inertia based on their masses.

### Step-by-Step Solution:

1. **Identify the Objects**: We have two objects - a tennis ball and a cricket ball. Both are initially stationary.

2. **Understand the Concept of Inertia**: According to Newton's First Law of Motion, an object at rest will remain at rest unless acted upon by an external force. The amount of force required to start moving an object depends on its mass (inertia).

3. **Compare the Masses**:
- A tennis ball is significantly lighter than a cricket ball.
- Therefore, the cricket ball has more mass and greater inertia compared to the tennis ball.

4. **Determine the Force Required**:
- Since the tennis ball has less mass, it requires less force to overcome its inertia and start moving.
- Conversely, the cricket ball, being heavier, requires more force to start moving.

5. **Evaluate the Options**:
- **Option A**: A less force is required for the cricket ball than the tennis ball - This is incorrect because the cricket ball is heavier.
- **Option B**: A less force is required for the tennis ball than the cricket ball - This is correct.
- **Option C**: The same force is required for both balls - This is incorrect as their masses differ.
- **Option D**: Nothing can be said - This is incorrect because we can conclude based on their masses.

6. **Conclusion**: The correct answer is **Option B**: A less force is required for the tennis ball than the cricket ball.