Answer
$9.78 m/s^2$
Work Step by Step
Given: $g=\frac{3.99\times10^{14}}{h^2+(1.28\times10^7)+(4.07+10^{13})}$
Substituting $h=8000$, we obtain: $g=\frac{3.99\times10^{14}}{(8000)^2+(1.28\times10^7)+(4.07+10^{13})}\approx9.78 m/s^2$
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