Metric System:
* Meters per second (m/s): The standard unit in physics and many scientific fields.
* Kilometers per hour (km/h): Used for road vehicles and general speed calculations.
* Centimeters per second (cm/s): Useful for smaller objects or slower speeds.
Imperial System:
* Miles per hour (mph): Commonly used in the United States and some other countries.
* Feet per second (ft/s): Used in some engineering and physics applications.
* Knots (kt): Used for maritime and aviation speeds. One knot is equal to one nautical mile per hour.
Other Units:
* Mach: Represents the speed of an object relative to the speed of sound. Mach 1 is the speed of sound, Mach 2 is twice the speed of sound, and so on.
* Light years: Used to measure the distances traveled by light in a year. While not a speed unit directly, it can be used to calculate the speed of light.
Important Note: Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude and direction). However, the units for both speed and velocity are the same.
