Answer:
\[S=ut+\frac{1}{2}a{{t}^{2}}\]
\[\Rightarrow S\propto {{t}^{2}}(\because a=k,\,\,u=0)\]
\[{{S}_{1}}:{{S}_{2}}:{{S}_{3}}:\,\,\,.............\,{{S}_{n}}\]
\[={{1}^{2}}:{{2}^{2}}:{{3}^{2}}:\,\,\,.............\,\,{{n}^{2}}\]
\[=1:4:9\,\,\,.............\,\,{{n}^{2}}\]
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