[tex]dane:\\m = 15 \ kg\\h = 18 \ m\\v_{o}=0\\g = 10\frac{N}{kg}\\szukane:\\E_{k} = ?\\\\Z \ zasady \ zachowania \ energii\\\\E_{p} = E_{k}\\\\mgh = E_{k}\\\\E_{k} = m\cdot g\cdot h\\\\E_{k} = 15 \ kg\cdot10\frac{N}{kg}\cdot18 \ m\\\\E_{k} = 2 \ 700 \ J = 2,7 \ kJ\\\\(1 \ kJ = 1000 \ J)[/tex]
