Answer:
Time taken by the first stone is \[=20=\frac{1}{2}\times 10\times {{t}^{2}}\]
\[\Rightarrow {{t}^{2}}=\frac{20}{5}\Rightarrow t=2s\]
\[{{h}_{1}}=\frac{1}{2}\times 10\times {{3}^{2}}=\frac{1}{2}\times 10\times 9=45m\]
\[{{h}_{2}}=\frac{1}{2}\times 10\times {{(t-1)}^{2}}\]
\[=\frac{1}{2}\times 10\times {{(1)}^{2}}=5m\]
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