[tex]Dane:\\v = 12\frac{m}{s}\\P = 72 \ W\\Szukane:\\F = ?\\\\Rozwiazanie\\\\P = \frac{W}{t} = \frac{F\cdot s}{t} = F\cdot v\\\\P = F\cdot v \ \ \ |:v\\\\F = \frac{P}{v}\\\\F = \frac{72 \ W}{12\frac{m}{s}} = \frac{72 \ kg\cdot\frac{m^{2}}{s^{3}}}{12\frac{m}{s}}=6 \ kg\cdot\frac{m}{s^{2}}\\\\\boxed{F = 6 \ N}[/tex]
