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The value of $g$ on the earth's surface is $980 \mathrm{~cm} / \mathrm{sec}^2$. Its value at a height of $64 \mathrm{~km}$ from the earth's surface is
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$960.40 \mathrm{~cm} / \mathrm{sec}^2$
$\frac{g^{\prime}}{g}=\left(\frac{R}{R+h}\right)^2=\left(\frac{6400}{6400+64}\right)^2 \Rightarrow g^{\prime}=960.40 \mathrm{~cm} / \mathrm{s}^2$
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