Respostas

2013-07-30T15:53:50-03:00
A)
S = a/2 x t²
40 = a/2 x 10²
40 = a x 50
a = 40/50
a = 0,8m/s²
b)
v = S/t
v = 40/10
v = 4m/s
9 4 9