a. Surely this problem was not given to you by your teacher. 850 km measured where? The radius of Earth at the poles is 22 km less than at the Equator.
b. It matters what kind of orbit. Circular, elliptical? ie, in what direction was it lunched into orbit...parallel to the Earth Surface, or not? What one needs to know, is what kind of orbit, the eccentricity, and where it was when "launched" at 850km above the Earth (where).
A polar satellite is launched at 850 km above earth.find its orbital speed
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