[tex]Dane:\\v_{o} = 0\\t = 20 \ s\\a = 2\frac{m}{s^{2}}\\Szukane:\\s = ?\\\\Rozwiazanie\\\\s = \frac{1}{2}at^{2}\\\\s = \frac{1}{2}\cdot2\frac{m}{s^{2}}\cdot(20 \ s)^{2}\\\\\boxed{s = 400 \ m}[/tex]
