[tex]v =20 \frac{m}{ {s}^{} } \\ t = \frac{v}{g} = \frac{20}{10} = 2s [/tex]
[tex]Dane:\\v_{o} = 0\\v = 20\frac{m}{s}\\g = 10\frac{m}{s^{2}}\\Szukane:\\t = ?\\\\Rozwiazanie\\\\v = g\cdot t \ \ /:g\\\\t = \frac{v}{g}\\\\t = \frac{20\frac{m}{s}}{10\frac{m}{s^{2}}}\\\\\boxed{t = 2 \ s}[/tex]
Odp. Po czasie t = 2 s.
