Respostas

2014-07-30T16:53:36-03:00
A) v = 6 - 2t
B) 20 = 6-2t
    20-6 = -2t
    14 = -2t
    t = -7 s
C) S = -20+6t-2t²
    S = -20+6.5-2.5²
    S = -20+30-2.25
    S = -20+30-50
    S = -40 m