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The acceleration due to gravity at height $$h$$ above the earth if $$h \ll R$$ (Radius of earth) is given by
$$g' = \frac{GM}{(R+h)^2} = \frac{GM}{R^2\left(1 + \frac{h}{R}\right)^2} = g\left(1 + \frac{h}{R}\right)^{-2}$$
$$\text{Applying the Binomial Theorem for } \frac{h}{R} \ll 1: \left(1 + \frac{h}{R}\right)^{-2} \approx 1 - \frac{2h}{R}$$
$$g' = g\left(1 - \frac{2h}{R}\right)$$
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