Answer:
\[a=\frac{{{v}^{2}}-{{u}^{2}}}{2s}=\]constant
\[S\propto {{V}^{2}}-{{u}^{2}}\Rightarrow \frac{{{S}_{2}}}{{{S}_{1}}}=\frac{v_{2}^{2}-u_{2}^{2}}{{{v}^{2}}-{{u}^{2}}}\,(or)\]
\[\frac{{{S}_{2}}}{8}=\frac{{{0}^{2}}-{{60}^{2}}}{{{0}^{2}}-{{30}^{2}}}\]
\[\Rightarrow {{S}_{2}}=\frac{60\times 60\times 8}{30\times 30a}=32m\]
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