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Velocity Velocity is a vector quantity that specifies the time rate of change of displacement with respect to a reference frame. If the reference frame is not inertial, the velocity is often designated "relative velocity".
| Conversions | | | | | | | | 1 mile per hour (mph) | = | 1.609 kilometres per hour (kph) | | 1 ms-1 | = | 3.280839 fts-1 | | 1 in s-1 | = | 0.0254 ms-1 | | 1 ft s-1 | = | 0.3048 ms-1 | | 1 km h-1 | = | 0.719 ms-1 | | 1 ft min-1 | = | 0.00508 ms-1 | | 1 knot | = | 0.515 ms-1 | | | | |
| Examples | | | Snail | 0.013 ms-1 | | Fast walk | 1.79 ms-1 (4 mph) | | Stephenson′s Rocket | 13.4 ms-1 (30 mph) | | Steam train speed record | 56.3 ms-1 (126 mph) | | Fastest boat (Spirit of Australia 1978) | 141.95 ms-1 (317.6 mph) | | Land speed record (Thrust SSC 1997) | 341.0 ms-1 (763 mph) | | Concorde | 597 ms-1 (1336 mph) | | Fastest plane (SR71 BlackBird) | 980 ms-1 (2193 mph) | | Escape velocity at surface of the Moon | 2.38x103 ms-1 | | Escape velocity at surface of the Earth | 1.12x104 ms-1 | | Escape velocity at surface of the Sun | 6.18x105 ms-1 | | Speed of light in vacuo | 2.998x108 ms-1 |
See also: Acceleration, Angular Velocity, Escape Velocity, Hypervelocity, Instantaneous Speed, Kilometres Per Hour, Length, Miles Per Hour, SI Units.
  
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