[tex]\displaystyle\bf\\\textbf{Energia cinetica (Ec) o calculam cu formula:}\\\\Ec=\frac{mV^2}{2}\\\\unde:\\\\ m = masa~~~[Kg]\\\\V=viteza~~~\Big[\frac{m}{s}\Big]\\\\Ec=Energia~cinetica~~~[J]\\\\Rezolvare:\\\\m=5~Kg\\\\V=10~\frac{m}{s}\\\\Ec=\frac{mV^2}{2}\\\\Ec=\frac{5\times10^2}{2}\\\\Ec=\frac{5\times100}{2}\\\\Ec=\frac{500}{2}\\\\\boxed{\bf~Ec=250~J}[/tex]
