Units of measurement
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Mile per hour (mph)
Kilometer per second (km/s)
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Information
Mile per hour (mph)
Mile per hour (mph) is a unit of speed equal to one mile traveled per hour. It is used in the United States and the United Kingdom to measure vehicle and aircraft speeds.
Kilometer per second (km/s)
Kilometer per second (km/s) is a unit of speed equal to one kilometer traveled per second. It is used in astronomy and high-speed research.