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Meter per second (U.S. spelling: meter per second) is an SI derived unit of both speed (scalar) and velocity (vector quantity which specifies both magnitude and a specific direction), defined by distance in meters divided by time in seconds.

This is the main unit of speed.

The official SI symbolic abbreviation is m·s−1, or equivalently, m/s; although the abbreviation mps is sometimes used colloquially, but is incorrect according to the BIPM. Where meters per second are several orders of magnitude too slow to be convenient, such as in astronomical measurements, velocities may be given in terms of kilometers per second, where 1 km/s is equivalent to 103 meters per second.

Conversions

1 m/s is equivalent to:

= 3.6 km·h−1 (exactly)
≈ 3.2808 feet per second (approximately)
≈ 2.2369 miles per hour (approximately)
≈ 1.9438 knots (approximately)

1 foot per second = 0.3048 m·s−1 (exactly)

1 mile per hour ≈ 0.4471 m·s−1 (approximately)

1 km·h-1 ≈ 0.2778 m·s−1 (approximately)

1 kilometer per second is equivalent to:

≈ 0.6213 miles per second (approximately)
≈ 2237 miles per hour (approximate)

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