Jawabanmu

2014-09-05T18:21:45+07:00
S = 9KM = 9000M
t = 30s
v?

v = s/t = 9000:30 = 300m/s
2014-09-05T18:25:40+07:00
9 km = 9000 m
1 jam = 3600 s
kec mobil = 9000/3600 m/s
=2,5 m/s
jd kalo jl selama 30 dtk
s = v.t = 2,5 x30 = 75 m