Mars rotates on its axis once every 24.8 hours. what is the altitude of a geosynchronous satellite orbiting mars.
i have the speed of geosynchronous orbiting mars. but i cant find the altitude of a geosynchronous satellite orbiting mars.

You have the answer right there in your hand, but
you're not sure of what you have yet.

If you have the speed, then ...

-- you know how far the satellite travels in 24.8 hours
and
-- you can figure out the radius of the circle that has
that distance for its circumference.

-- That radius is the distance of the satellite from the center of
the planet, when it's revolving once in 24.8 hours at that speed.


By the way ... I wouldn't exactly call that a 'geo-synchronous' satellite,
because 'geo...' means something related to the Earth.
It would have to be a 'marso-synchronous' satellite, or whatever the
Greek word for Mars is.