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Home > Kilometre per second
kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. It is equal to 1,000 m/s.1 km/s is about the top speed of a sub-orbital spacecraft.
A typical value for the specific impulse of current rockets is 4.5 km/s.
See also
SI derived units of velocity
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