Here's why:

* Speed vs. Velocity: Speed is the rate at which an object moves, while velocity includes both speed and direction.

* Average Speed: Average speed is calculated over a period of time, like "The car traveled at an average speed of 60 mph during the trip."

* Instantaneous Speed: Instantaneous speed refers to the speed of an object at a specific point in time. It's the speed you see on your speedometer at any given moment.

Example: Imagine you're driving a car. The speedometer shows your instantaneous speed. If the speedometer reads 50 mph, that's your instantaneous speed at that moment.

Key Points:

* Instantaneous speed is a snapshot of speed at a particular instant.

* It can change constantly, even if the object is moving at a constant velocity.

* To measure instantaneous speed accurately, you need tools like a speedometer or a device that can measure speed over very short time intervals.