[tex]dane:\\h = 25 \ m\\W = 150 \ kJ = 150 \ 000 \ J=150 \ 000 \ N\cdot m\\g = 10\frac{N}{kg}\\szukane:\\m = ?\\\\Rozwiazanie\\\\W = E_{p} = mgh\\\\W = mgh \ \ /:gh\\\\m = \frac{W}{gh}\\\\m = \frac{150000 \ N\cdot m}{10\frac{N}{kg}\cdot25 \ m}\\\\m = 600 \ kg[/tex]
