Respostas

2013-10-07T16:56:25-03:00
200m/20s
400m/ x
200x = 8000
x = 8000/200
x = 40 segundos
2013-10-07T17:01:29-03:00
▲s = 200+400 = 600m
▲t = 20 s

v = ▲S/▲ t
v = 600/20
v= 30m/s