Respostas

2014-07-03T23:54:43-03:00
A)  S1 = 8+ 6.5 = 38
     S2 = 30 - 2.5 = 20

b) S1 = S2
   8 +6.t = 30 - 2.t
8.t = 22
t = 22/8
t = 2,75
t ≈ 3s
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