Here's a breakdown:

* Definition: Speed is a scalar quantity that describes how quickly an object is moving. It is the distance traveled by an object per unit of time.

* Formula: Speed = Distance / Time

* Units: Common units of speed include meters per second (m/s), kilometers per hour (km/h), and miles per hour (mph).

Key Points:

* Distance: The total length of the path traveled.

* Time: The duration of the motion.

* Scalar Quantity: Speed only has magnitude (how much) and not direction.

* Average Speed: Total distance traveled divided by the total time taken.

* Instantaneous Speed: Speed at a specific moment in time.

Examples:

* A car traveling at 60 km/h.

* A runner completing a 100-meter race in 10 seconds.

* A snail crawling at 1 centimeter per minute.

Important Note: Speed is often confused with velocity. While speed only tells us how fast something is moving, velocity also includes the direction of movement.