Odpowiedź :
[tex]Dane:\\m = 30 \ kg\\v = 5\frac{m}{s}\\Szukane:\\E_{k} = ?\\\\\\E_{k} = \frac{1}{2}mv^{2}\\\\E_{k} = \frac{1}{2}\cdot30 \ kg\cdot(5\frac{m}{s})^{2}}\\\\\boxed{E_{k} = 375 \ J}[/tex]
[tex]Dane:\\m = 30 \ kg\\v = 5\frac{m}{s}\\Szukane:\\E_{k} = ?\\\\\\E_{k} = \frac{1}{2}mv^{2}\\\\E_{k} = \frac{1}{2}\cdot30 \ kg\cdot(5\frac{m}{s})^{2}}\\\\\boxed{E_{k} = 375 \ J}[/tex]