* Non-uniform motion: This refers to any movement where the speed changes over time. A car accelerating, a ball thrown in the air, and a rollercoaster are all examples of non-uniform motion.
* Average speed: This is the total distance traveled divided by the total time taken. While the object might have traveled at different speeds during the journey, the average speed represents the overall speed.
* Instantaneous speed: This is the speed of an object at a specific moment in time. For example, a car's speedometer shows the instantaneous speed.
* Variable speed limits: Roads can have variable speed limits, which adjust based on traffic conditions, weather, or other factors.
To understand "speed that varies" better, you need more context. What specifically are you interested in? For example:
* Do you want to know how to calculate speed that varies over time?
* Are you looking for examples of objects that have varying speeds?
* Do you want to understand the difference between average speed and instantaneous speed?
Please provide more information so I can give you a more specific and helpful answer.
