[tex]dane:\\P = 300 \ W\\m = 150 \ kg\\h = 15 \ m\\g = 10\frac{N}{kg}\\szukane:\\t = ?\\\\W = E_{p} = mgh\\\\W = mgh = 150 \ kg\cdot10\frac{N}{kg}\cdot15 \ m = 22 \ 500 \ J\\\\P = \frac{W}{t} \ \ \rightarrow \ \ t = \frac{W}{P}\\\\t = \frac{22 \ 500 \ J}{300 \ W} = 75 \ s = 1 \ min \ i \ 15 \ s[/tex]
