Respostas

2013-08-14T12:22:22-03:00
V² = Vo² + 2*a*/\S

0 = 20² + 2*a*50

-400 = 100a

-400/100 = a

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a = -4m/s² , sinal negativo concluindo que houve uma desaceleração
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4 4 4