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
escape velocity
delta-v budget
.
Hohmann transfer orbit
for some examples of
orbital speeds
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