\left\{ \begin{array} { l } { \frac { 1 } { 2 } \cdot \frac { 9,8 } { 6 } \times t ^ { 2 } = 15000 } \\ { v = \frac { 9.8 } { 6 } \cdot t } \end{array} \right.
Solve for t, v
t=-\frac{300\sqrt{10}}{7}\approx -135.526185436\text{, }v=-70\sqrt{10}\approx -221.359436212
t=\frac{300\sqrt{10}}{7}\approx 135.526185436\text{, }v=70\sqrt{10}\approx 221.359436212
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