Respostas

2014-07-19T19:02:56-03:00
20 min = 1/3 hora 

a =  \frac{s}{t}=  \frac{500}{ \frac{1}{3}}= 500.3 = 1500 km^{2}/h

1500/3600 = 0,41 m^{2}/s
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