[tex]ec = \frac{mv {}^{2} }{2} \\ 200000 = \frac{m \times 20 {}^{2} }{2} \\ 400000 = 400m \\ m = \frac{400000}{400} = 1000kg[/tex]
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[tex]ec = \frac{mv {}^{2} }{2} \\ 200000 = \frac{m \times 20 {}^{2} }{2} \\ 400000 = 400m \\ m = \frac{400000}{400} = 1000kg[/tex]
Espero Ajudar