What is the SI unit for measuring velocity?

The SI unit for measuring velocity is meters per second, represented as m/s. Velocity is defined as the rate of change of position with respect to time, and in the International System of Units (SI), the meter is the standard unit for distance, while the second is the standard unit for time. Therefore, when calculating velocity, the distance traveled in meters divided by the time taken in seconds results in the unit m/s, which effectively communicates how fast an object is moving in a straight line.

In contrast, kilometers per second (km/s) is also a unit of velocity, but it is not the base SI unit, making it less commonly used in contexts requiring strict adherence to SI. Meters per hour (m/hr) can measure velocity but is not standard for scientific calculations, as dividing meters by hours does not conform with the SI time measurement. Meters per second squared (m/s²) is actually a unit of acceleration, not velocity, indicating how velocity changes over time. Thus, m/s is the appropriate and most widely accepted unit for expressing velocity in accordance with SI standards.