[tex]s = h = 5 \ m\\g = 10\frac{m}{s^{2}}\\t = ?\\\\h = \frac{gt^{2}}{2} \ \ |\cdot\frac{2}{g}\\\\t^{2} = \frac{2h}{g}}\\\\t = \sqrt{\frac{2h}{g}}\\\\t = \sqrt{\frac{2\cdot5 \ m}{10\frac{m}{s^{2}}}}=\sqrt{1 \ s^{2}} = 1 \ s[/tex]
Odp. Lot trwał 1 sekundę.
