[tex]dane:\\m = 100 \ kg\\v_{o} = 0\\t = 20 \ s\\v = 36\frac{km}{h} = 36\cdot\frac{1000 \ m}{3600 \ s} = 10\frac{m}{s}\\szukane:\\F = ?\\\\Rozwiazanie\\\\a = \frac{\Delta v}{t} = \frac{v-v_{o}}{t} = \frac{v}{t} = \frac{10\frac{m}{s}}{20 \ s} = 0,5\frac{m}{s^{2}}\\\\F = m\cdot a\\\\F = 100 \ kg\cdot0,5\frac{m}{s^{2}}\\\\F = 50 \ N[/tex]
