[tex]dane:\\v_1 = 94\frac{km}{h}\\t = 20 \ s\\v_2 = 18\frac{km}{h}\\szukane:\\a = ?\\\\Rozwiazanie\\\\a = \frac{\Delta v}{t}\\\\\Delta v = v_1 - v_2 = (94-18)\frac{km}{h} = 76\frac{km}{h} = 76\cdot\frac{1000 \ m}{3600 \ s} = 21,(1)\frac{m}{s}\approx21,1\frac{m}{s}\\\\a = \frac{21,1\frac{m}{s}}{20 \ s}\\\\a\approx1,06\frac{m}{s^{2}} \ - \ opoznienie[/tex]