# Definition:Velocity/Units

## Definition

### SI

The SI unit of velocity is the metre per second $\mathrm m \ \mathrm s^{-1}$, or, less formally, $\mathrm m / \mathrm s$.

### CGS

The CGS unit of velocity is the centimetre per second $\mathrm {cm} \ \mathrm s^{-1}$, or, less formally, $\mathrm {cm} / \mathrm s$.

### FPS

The FPS unit of velocity is the foot per second $\mathrm f \ \mathrm s^{-1}$, or, less formally, $\mathrm f / \mathrm s$.

## Conversion Factors

 $\ds$  $\ds 1$ $\ds \mathrm m \ \mathrm s^{-1}$ SI unit $\ds$ $=$ $\ds 10^2 = 100$ $\ds \mathrm {cm} \ \mathrm s^{-1}$ CGS unit $\ds$ $=$ $\ds 3.281$ $\ds \mathrm f \ \mathrm s^{-1}$ FPS unit