[tex]\large\boxed{\begin{array}{l}\sf v^2=2\cdot g\cdot h\\\sf v^2=2\cdot10\cdot20\\\sf v^2=400\\\sf v=\sqrt{400}\\\sf v=20\,m/s\end{array}}[/tex]
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[tex]\large\boxed{\begin{array}{l}\sf v^2=2\cdot g\cdot h\\\sf v^2=2\cdot10\cdot20\\\sf v^2=400\\\sf v=\sqrt{400}\\\sf v=20\,m/s\end{array}}[/tex]