Units of measurement
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Calculations
Kilometer per hour (km/h)
Speed of light (c)
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Information
Kilometer per hour (km/h)
Kilometer per hour (km/h) is a unit of speed equal to one kilometer traveled per hour. It is commonly used to measure vehicle speeds.
Speed of light (c)
Speed of light (c) is a fundamental physical constant equal to 299,792,458 m/s. It is the maximum speed at which information or matter can travel.