How to claculate the speed of 2.0 and 16.2 j

Réponse :

[tex]E_c = \frac{1}{2} mv^2\\<=>\\v=\sqrt{\frac{2E_c}{m} }[/tex]

[tex]v=\sqrt{\frac{2\times 16.2}{2.0} }[/tex]

[tex]v=4.0\:m.s^{-1}[/tex]