Question Number 27198 by mondodotto@gmail.com last updated on 03/Jan/18
Answered by mrW1 last updated on 03/Jan/18
$$\frac{\mathrm{1}}{\mathrm{2}}{gt}^{\mathrm{2}} −{ut}+{s}=\mathrm{0} \\ $$$$\Rightarrow\:{t}=\frac{{u}\pm\sqrt{{u}^{\mathrm{2}} −\mathrm{2}{gs}}}{{g}} \\ $$