Metre 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 metres 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 metres per second are several orders of magnitude too slow to be convenient, such as in astronomical measurements, velocities may be given in terms of kilometres per second, where 1 km/s is equivalent to 10^{3} metres per second.
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1 m/s is equivalent to:
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 kilometre per second is equivalent to:
Although m·s^{−1} is an SI derived unit, it could be viewed as more fundamental than the metre, since the latter is derived from the speed of light in a vacuum, which is defined as exactly 299 792 458 m·s^{−1} by the BIPM^{[1]}. It follows that one metre is the length of the path travelled by light in a vacuum during a time interval of 1/299 792 458 of one second.
Metre per second is an SI unit of measurement of both speed and velocity. It is defined by the distance in metres divided by the time in seconds. Its abbreviation is m/s or m·s^{1}. In astronomy, the unit is sometimes used in kilometres per second (equivalent to 1000 metres per second).
1 metre per second is equivalent to:
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 kilometre per second is equivalent to:
