Answer :

[tex]S=\frac{1}{2}*gt^2 \\ \\ gt^2=\frac{S}{\frac{1}{2}} =\frac{S}{1}*\frac{2}{1}=2S \\ \\ gt^t=2S \\ \\ \boxed{g=\frac{2S}{t^2}}[/tex]

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