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Speed Units Conversion
Speed (symbol: v) is the rate of motion, or equivalently the rate of change of position, expressed as distance d moved per unit of time t. Speed is a scalar quantity with dimensions distance/time; the equivalent vector quantity to speed is known as velocity. Speed is measured in the same physical units of measurement as velocity, but does not contain the element of direction that velocity has. Speed is thus the magnitude component of velocity.
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Kilometres per hour (American English: kilometers per hour) is a unit of both speed (scalar) and velocity (vector). The unit symbol is km/h or km·h-1. The incorrect abbreviations "kph" and "kmph" are sometimes also seen in English-speaking countries, in analogy to mph. In North American slang and military usage, km/h (as well as km) is commonly pronounced, and sometimes even written, as klicks or kays (K's).
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Convert from speed of light (vacuum)
kilometer per hour (km/h)
kilometer per second (km/s)
centimeter per second (cm/s)
meter per second (m/s)
millimeter per second (mm/s)
foot per minute (ft/min)
mile per hour (mph)
mile per second (mps)
foot per second (ft/s)
inch per second (in/s)
knot (kn)
mach
minute per kilometer
second per kilometer
second per 100 metres
minute per mile
second per mile
second per 100 yards
speed of light (vacuum)
speed of sound (air)
Value
...calculating...
Format result
0 decimals
1 decimals
2 decimals
3 decimals
4 decimals
5 decimals
6 decimals
7 decimals
1 speed of light (vacuum) is equal to:
Metric
kilometer per hour
1079252848.8
kilometer per second
299792.458
centimeter per second
29979245800
meter per second
299792458
millimeter per second
299792458000
British and U.S.
foot per minute
59014263385.8268
mile per hour
670616629.3844
mile per second
186282.3971
foot per second
983571056.4304
inch per second
11802852677.1654
Nautical
knot
582749918.3585
mach
880991.09
For runners and joggers
minute per kilometer
5.5594 x 10
-08
second per kilometer
3.3356 x 10
-06
second per 100 metres
3.3356 x 10
-07
minute per mile
8.947 x 10
-08
second per mile
5.3682 x 10
-06
second per 100 yards
3.0501 x 10
-07
Other
speed of light (vacuum)
1
speed of sound (air)
880991.09
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