Respostas

2014-03-15T09:46:24-03:00
Resposta

Converter as velocidades

Vo = 18km/h = 5m/s

V = 72km/h = 20m/s

a =  \frac{V - Vo}{T - To}

a =  \frac{20-5}{12-7}

a =  \frac{15}{5}

a = 3m/s ^{2}