[tex]dane:\\m = 130 \ kg\\E_{p} = 39 \ kJ = 39 \ 000 \ J\\g = 10\frac{m}{s^{2}} = 10\frac{N}{kg}\\szukane:\\h = ?\\\\E_{p} = mgh \ \ /:mg\\\\h = \frac{E_{p}}{mg}\\\\h =\frac{39000 \ J}{130 \ kg\cdot10\frac{N}{kg}} = \frac{39000 \ N\cdot m}{1300 \ N}\\\\h = 30 \ m[/tex]
