Um automóvel de massa 1000kg se movimentando a 36km/h, possui quantos Joules de energia cinética?
a) 5000
b) 10000
c) 50000
d) 100000
Resposta: A energia cinética é dada por: ( Ec=displaystylefrac{mxu^2}{2} )
Devemos transformar a velocidade para m/s. Ou seja, dividimos por 3.6
( =displaystylefrac{36}{3.6}= 10frac{m}{8} )
Agora substituirmos na fórmula
( Ec= displaystylefrac{1000×10^2}{2}= frac{1000×100}{2}= frac{100000}{2} )
Ec = 5000J
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