Jawabanmu

2014-08-24T22:21:05+07:00
Diket: v0 = 0 m/s
          vt = 72 km/jam ⇒ 72.1000/3600 m/s = 20 m/s
           t = 30 s
Dit: a = ....?
Jwb:
vt = v0 + a.t
20 = 0 + a.30
20 = a.30
a = 20/30
a = 0,67 m/s²