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The SI unit of speed is Meter per Second [m/s].
Unit
Converter
kilometer per hour [km/h]
0.2777777778
mile per hour [mph]
0.4470311111
kilometer per second [km/s]
1000
mile per second [mi/s]
1609.344
meter per second [m/s]
1
foot per second [ft/s]
0.3048
knot per hour [kn]
0.5144444444
Mach
340.29
speed of light [c]
299792458
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4
digits after the decimal.