The SI unit for speed is the meter per second (m/s).
Speed is defined as the distance traveled per unit of time. In the International System of Units (SI), distance is measured in meters and time is measured in seconds. Therefore, when you divide a distance expressed in meters by the time taken in seconds, you get a value in meters per second, which is the standard unit for measuring speed.
This unit helps to provide a clear and consistent way to measure how quickly something is moving. For example, if a car travels 100 meters in 5 seconds, its speed would be calculated as 100 meters divided by 5 seconds, resulting in a speed of 20 m/s.