5.
[tex]Dane:\\h = 25 \ m\\W = 150 \ kJ = 150 \ 000 \ J\\g = 10\frac{N}{kg}\\Szukane:\\m = ?\\\\Rozwiazanie\\\\W = E_{p} = mgh\\\\W = mgh \ \ \ |:gh\\\\m = \frac{W}{gh}\\\\m = \frac{150000 \ J}{10\frac{N}{kg}\cdot25 \ m} =\frac{150000 \ N\cdot m}{250\frac{N\cdot m}{kg}}\\\\\boxed{m = 600 \ kg}[/tex]
