Give examples of nearly perfect classic & plastic bodies ?

Explanation

To answer the question about examples of nearly perfect elastic and plastic bodies, we can follow these steps:

### Step 1: Understand Elastic and Plastic Bodies
- **Elastic Bodies**: These are materials that return to their original shape after the removal of the applied force. They exhibit elastic behavior up to a certain limit known as the elastic limit.
- **Plastic Bodies**: These materials do not return to their original shape after the removal of the applied force. Instead, they undergo permanent deformation.

### Step 2: Identify Nearly Perfect Elastic Bodies
- **Example**: Quartz Fiber
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