Jawabanmu

2014-05-08T18:53:09+07:00
Kelajuan=jarak:waktu
           =120m:30s
           =4m/s


1 5 1
2014-05-08T18:53:45+07:00
Jarak=120m
waktu=30s

jawab
120m/30s = 4m/s