From Wikipedia, the free encyclopedia.
- For alternative meanings of Speed, see Speed (disambiguation).
Units of speed include:
- meter per second, (symbol m/s), the SI derived unit
- kilometer per hour, (symbol km/h)
- mile per hour, (symbol mph)
- knot (nautical miles per hour)
- Mach, where Mach 1 is the speed of sound; Mach n is n times as fast.