Jawabanmu

2014-09-11T15:37:00+07:00
Dik=v0=0m/s vt=72km/jam=20m/s t=30s
dit=a?
jawab=a=vt-v0/t
=20m/s-0m/s / 30s
=20m/s / 30s
=0,66..