Jawabanmu

2014-09-05T19:47:35+07:00
Arak = Kecepatan X Waktu
Jarak = 72 km/jam X 30 sekon
        = 2160 km
2014-09-05T19:52:06+07:00
Diket: v0= 0 m/s, vt=72 km/jam⇒ 72000/3600 = 20 m/s, t= 30 s
Dit: a=..?
jwb
vt = v0 + a.t
20= 0  + a.30
a =  20/30
a = 0,67 m/s²