Velocity is the measurement of distance traveled over a period of time. The metric system uses meters/second (m/s) and kilometers/hour (km/h). The Imperial system uses miles/hour (mph) and knots (kn). Velocity is used when checking speedometers, determining vehicle acceleration performance, and determining fuel consumption.
| Velocity conversions | |
| 1 kn = 1.15 mph | 1 m/s = 3.6 km/h |
| 1 mph = 0.87 kn | 1 km/h = 0.27 m/s |
| 1 mph = 1.6 km/h | 1 km/h = 0.62 mph |
| 1 kn = 1.85 km/h | 1 km/h = 0.55 kn |
