[tex]dane:\\m = 1000 \ kg\\v = 54\frac{km}{h} = 54\cdot\frac{1000 \ m}{3600 \ s} = 15\frac{m}{s}\\szukane:\\E_{k} = ?\\\\Rozwiazanie\\\\E_{k} = \frac{1}{2}mv^{2}\\\\E_{k} = \frac{1}{2}\cdot1000 \ kg\cdot(15\frac{m}{s})^{2}\\\\E_{k} = 112 \ 500 \ J = 112,5 \ kJ[/tex]
