Answer:
\[{{h}_{max}}=19.6\text{ }m\] \[u=?\] \[v=0\] \[(\because h={{h}_{max}})\] \[g=9.8\text{ }m/{{s}^{2}}\] We know \[{{v}^{2}}{{u}^{2}}=2gh\] \[\Rightarrow \]\[{{0}^{2}}{{u}^{2}}=2\times (9.8)\times 19.6\] \[\Rightarrow \]\[{{u}^{2}}=19.6\times 19.6\] \[\Rightarrow \] \[u=19.6\text{ }m/s\]
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