find the acccelation of gravity at an altitude of 600km

Answer 1

On the surface of Earfh: mg = GmM/r²;

If altitude h then mg_h = GMm(r + h)².

By division we get: g_h/g = r²/r + h)²; g_h = 9.8m/s²6371²km²/(6371 + 600)²km² = 8..19 m/s²