[tex]Dane:\\v_1 = 128\frac{km}{h}\\t = 4 \ s\\v_2 = 200\frac{km}{h}\\Szukane:\\a = ?\\\\Rozwiazanie\\\\a = \frac{\Delta v}{t}\\\\\Delta v = v_2 - v_1 = (200-128)\frac{km}{h} = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\\\a = \frac{20\frac{m}{s}}{4 \ s}\\\\\boxed{a = 5\frac{m}{s^{2}}}[/tex]
