[tex]dane:\\F = 240 \ kN = 240\cdot1000 \ N = 240 \ 000 \ N\\v = 72\frac{km}{h} = 72\cdot\frac{1000 \ m}{3600 \ s} = 20\frac{m}{s}\\szukane:\\P = ?\\\\P = \frac{W}{t} = \frac{F\cdot s}{t} = F\cdot v\\\\P = F\cdot v\\\\P = 240000 \ N\cdot20\frac{m}{s} \\\\P = 4 \ 800 \ 000 \ W = 4 \ 800 \ kW = 4,8 \ MW\\\\\\1 \ kW = 1000 \ W\\1 \ MW = 1 \ 000 \ 000 \ W[/tex]
