Respostas

2013-07-11T00:33:40-03:00
A) 30 -40 = -10/5 = -2m/s²
       5

b) V = 40 -2t

c) V = 40 -2t
    0 = 40 - 2t
       2t = 40
       t = 40/2
        t = 20s
3 4 3