At the surface of the Earth, $r = R$, where $R$ is the radius of the Earth, and $g = g_0 = 9.8 m/s^2$.
$$g_0 = \frac{GM}{R^2}$$
At an altitude $h$ above the surface of the Earth, $r = R + h$, and $g = 1.1 m/s^2$.
$$g = \frac{GM}{(R+h)^2}$$
We can
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