A car travels 10 km in the first 15 minutes, 15 km in the next 15 minutes, and 20 km in the last 15 minutes. Is this an example of uniform or non-uniform motion? Justify your answer.

This is an example of non-uniform motion. Uniform motion is when an object covers equal distances in equal intervals of time. In this case, the car covers different distances (10 km, 15 km, 20 km) in equal intervals of time (15 minutes each). Therefore, its speed is changing, indicating non-uniform motion.