[tex]dane:\\v_{o} = 0\\t = 5 \ s\\v = 18\frac{km}{h} = 18\cdot\frac{1000 \ m}{3600 \ s} = 5\frac{m}{s}\\szukane:\\a = ?\\\\Rozwiazanie\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t}\\\\a = \frac{5\frac{m}{s}}{5 \ s}\\\\a = 1\frac{m}{s^{2}}[/tex]
