Velocity is a vector quantity, meaning it has both magnitude and direction. The magnitude of velocity is speed, and it is measured in units of distance per unit time.

Here are some common units for velocity:

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

* Kilometers per hour (km/h): This is commonly used for vehicle speeds.

* Miles per hour (mph): This is used in the United States and some other countries.

* Feet per second (ft/s): This is sometimes used in engineering and physics.

* Knots (kt): This unit is used for nautical speeds and is equal to one nautical mile per hour.

The specific unit of velocity used will depend on the context.