The units used to measure both velocity and speed are the same, but velocity is a vector quantity while speed is a scalar quantity.

Here are the common units for both:

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

* Kilometers per hour (km/h): Often used for road vehicles.

* Miles per hour (mph): Commonly used in the United States.

* Feet per second (ft/s): Used in some engineering applications.

Key Difference:

* Velocity includes both magnitude (speed) and direction. For example, 20 m/s north is a velocity.

* Speed only considers the magnitude. For example, 20 m/s is a speed.

Let me know if you would like more examples or explanations!