[tex]dane:\\m = 2 \ t = 2 \ 000 \ kg\\h = 20 \ m\\t = 10 \ s\\g = 10\frac{N}{kg}\\szukane:\\P = ?\\\\P = \frac{W}{t}\\\\W = E_{p} = mgh = 2000 \ kg\cdot10\frac{N}{kg}\cdot20 \ m = 400 \ 000 \ J\\\\P = \frac{400000 \ J}{10 \ s}\\\\P = 40 \ 000 \ W = 40 \ kW[/tex]
