[tex]V=20m/s\\h=V*t-\frac{gt^{2} }{2} \\h=V*\frac{V}{g} -\frac{g*\frac{V^{2} }{g^{2} } }{2} \\h=\frac{V^{2} }{2g}\\h=\frac{V^{2} }{2g} =\frac{20^{2} }{2*9.81} =20.39m\\[/tex]
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[tex]V=20m/s\\h=V*t-\frac{gt^{2} }{2} \\h=V*\frac{V}{g} -\frac{g*\frac{V^{2} }{g^{2} } }{2} \\h=\frac{V^{2} }{2g}\\h=\frac{V^{2} }{2g} =\frac{20^{2} }{2*9.81} =20.39m\\[/tex]