[tex]Dane:\\v_{o} = 0\\t = 5 \ s\\s = 10 \ m\\Szukane:\\a = ?\\\\s = \frac{at^{2}}{2} \ \ /\cdot2\\\\at^{2} = 2s \ \ /:t^{2}\\\\\underline{a = \frac{2s}{t^{2}}}\\\\a = \frac{2\cdot10 \ m}{(5 \ s)^{2}} = \frac{20 \ m}{25 \ s^{2}}\\\\\boxed{a = 0,8\frac{m}{s^{2}}}[/tex]
