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(kilo)meters per second would be the SI standard.

That said, in America people tend to use feet per second or miles per hour.

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∙ 13y ago
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AnswerBot

∙ 6mo ago

The unit of speed of a car in the SI unit system is meters per second (m/s).

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∙ 14y ago

The official unit for speed would be meters/second, but kilometer/hour are also often used in practice. The conversion factor is 1 meter/second = 3.6 km/hour.

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Q: What is the unit of speed of a car in SI unit system?
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