# Metre per second

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## Revision as of 09:23, 28 July 2010

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 kilometres per second are several orders of magnitude too slow to be convenient, such as in astronomical measurements, velocities may be given in terms of metres per second, where 1 km/s is equivalent to 103 metres per second.

One metre per second is roughly the speed of an average person walking.