assuming the Earth is a sphere? So g at the surface is the same at the polar cap as it is at the equator.
v^2/d= g(re/(re+h))^2
v^2= 9.8m/s^2 * re^2 (re+h)/(re+h)^2= 9.8 re^2/(re+h) insert your value of radius of Earth (re) and altitude h. Watch units, put all in meters.
solve for v in m/s
A polar satellite is launched at 850km above earth.Find its orbital speed.
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