[tex]Dane:\\m = 6 \ kg\\t = 6 \ s\\\Delta v = 9\frac{m}{s}\\Szukane:\\F = ?\\\\Rozwiazanie\\\\F = m\cdot a\\\\ale\\\\a = \frac{\Delta v}{t} = \frac{9\frac{m}{s}}{6 \ s} = 1,5\frac{m}{s^{2}}\\\\F = 6 \ kg\cdot1,5\frac{m}{s^{2}}\\\\\boxed{F = 9 \ N}[/tex]
