Statement -I : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
Statement -II : During collision intermolecular space decreases and hence elastic potential energy increases

Options

A. Statement I & II are true
B. Statement I is true, Statement II is false
C. Statement I is false, Statement II is true
D. Statement I & II are false

Explanation

To analyze the statements provided in the question, we will evaluate each statement step by step.

### Step 1: Understanding Statement I
**Statement I**: "If collision occurs between two elastic bodies, their kinetic energy decreases during the time of collision."

- When two elastic bodies collide, they do experience a change in kinetic energy during the collision. This is because, at the moment of collision, the bodies deform slightly due to the forces acting between them.
- The kinetic energy is converted into other forms of energy (like elastic potential energy) during the time of collision. Therefore, the kinetic energy does decrease during the collision.

### Step 2: Understanding Statement II
**Statement II**: "During collision intermolecular space decreases and hence elastic potential energy increases."

- During the collision, the two elastic bodies deform, which means that the intermolecular distance between the particles within the bodies decreases.
- As the intermolecular space decreases, the potential energy stored in the elastic deformation of the bodies increases. This is because the elastic potential energy is related to the deformation of the material, which occurs during the collision.

### Conclusion
- **Statement I** is **True**: Kinetic energy decreases during the collision due to conversion into other forms of energy.
- **Statement II** is **True**: The decrease in intermolecular space leads to an increase in elastic potential energy.

### Final Answer
Both statements are true.

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