[tex]Dane:\\v_1 = 10\frac{m}{s}\\t = 5 \ s\\v_2 = 90\frac{km}{h} = 90\cdot\frac{1000 \ m}{3600 \ s} = 25\frac{m}{s}\\Szukane:\\a = ?\\\\\\a = \frac{\Delta v}{t} = \frac{v_2-v_1}{t}\\\\a = \frac{25\frac{m}{s}-10\frac{m}{s}}{5 \ s}\\\\\boxed{a = 3\frac{m}{s^{2}}}[/tex]
