[tex]dane:\\v_{o} = 0\\h = 45 \ m\\g = 10\frac{m}{s^{2}}\\szukane:\\t = ?\\v = ?[/tex]
Czas t:
[tex]h = \frac{gt^{2}}{2} \ \ /\cdot\frac{2}{g}\\\\t^{2} = \frac{2h}{g}\\\\t = \sqrt{\frac{2h}{g}}\\\\t = \sqrt\frac{2\cdot45 \ m}{10\frac{m}{s^{2}}}\\\\\underline{t = 3 \ s}[/tex]
Prędkosć v:
[tex]v = g\cdot t\\\\v = 10\frac{m}{s^{2}}\cdot3 \ s\\\\\underline{v = 30\frac{m}{s}}[/tex]
