Respostas

A melhor resposta!
2014-04-07T10:35:07-03:00
2014-04-07T10:38:24-03:00
F=m.a => 9000=m.10 m=900kg
50km/h ÷ 3,6= 13,8m/s

Ec= (mv^2)/2 => (900*13,8^2)/2= 85698 J