Respostas

2014-06-10T22:06:27-03:00
V^2=Vo^2 + 2.a.d

20^2=Vo^2 + 2.a.100

400 = 0 + 200.a

 a=\frac{400}{200} = 2m/s

e

V = V0 +at

20 = 0 + 2t

t = 10s