Resposta :
[tex]\Large \text {$ \sf Dados: \dfrac {} {}$}\\\Large \text {$ \sf Ec = ? \dfrac {} {}$}\\\Large \text {$ \sf m = 7000 kg \dfrac {} {}$}\\\Large \text {$ \sf v = 30 m/s \dfrac {} {}$}[/tex]
[tex]\Large \text {$ \sf Ec = \dfrac {m.v^{2}} {2}$}\\[/tex]
[tex]\Large \text {$ \sf Ec = \dfrac {7000.30^{2} } {2}$}[/tex]
[tex]\Large \text {$ \sf Ec = 3150000 J \dfrac {} {}$}[/tex]