[tex]dane:\\v_{o} = 18\frac{km}{h}\\ = 10 \ s\\v = 72\frac{km}{h}\\szukane:\\a = ?\\\\a = \frac{\Delta v}{t}\\\\\Delta v = v-v_{o} = 72\frac{km}{h}-18\frac{km}{h} = 54\frac{km}{h} = 54\cdot\frac{1000 \ m}{3600 \ s} = 15\frac{m}{s}\\\\a = \frac{15\frac{m}{s}}{10 \ s} = 1,5\frac{m}{s^{2}}[/tex]
