A thin meter scale is kept vertical by placing its lower end hinged on floor. It is allowed to fall. Calculate the velocity of its upper end when it hits the floor.

Explanation

To solve the problem of calculating the velocity of the upper end of a thin meter scale when it hits the floor after being allowed to fall from a vertical position, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the System**:
- The meter scale is hinged at one end on the floor and is initially held vertically. When released, it will rotate about the hinge as it falls.

2. **Identify the Energy States**:
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