* Meters per second (m/s) - This is the standard unit in the International System of Units (SI).

* Kilometers per hour (km/h) - Commonly used in Europe and other parts of the world.

* Miles per hour (mph) - Commonly used in the United States and other English-speaking countries.

* Knots (kt) - A nautical unit used primarily in aviation and maritime navigation.

The specific unit used will depend on the context and location. For example, weather forecasts in the United States typically use mph, while those in Europe often use km/h.