[tex]Dane:\\v_{o} = 0\\t = 4 \ s\\v = 22\frac{km}{h} = 22\cdot\frac{1000 \ m}{3600 \ s} = 6,(1)\frac{m}{s} = 6,1\frac{m}{s}\\szukane:\\a = ?\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t}\\\\a = \frac{6,1\frac{m}{s}}{4 \ s}\\\\\boxed{a \approx1,5\frac{m}{s^{2}}}[/tex]
