A boy walks first a distance of 0.5 km in 10 minutes, next 10 km in 20 minutes and last 1.5 km in 30 minutes. Is the motion uniform ? Find the average speed of the boy in `ms^(-1)` .

Explanation

To solve the problem step by step, we will first determine whether the boy's motion is uniform and then calculate his average speed in meters per second.

### Step 1: Determine if the motion is uniform
- **Definition of Uniform Motion**: A body is said to be in uniform motion if it travels equal distances in equal intervals of time.
- **Distances and Times**:
- First distance: 0.5 km in 10 minutes
- Second distance: 10 km in 20 minutes
- Third distance: 1.5 km in 30 minutes
...