Jawabanmu

2014-08-25T19:04:43+07:00
Kec awal= vo = 0m/s
vt = 72km/jam = 7200m/3600s = 20m/s
t = 30s
a=?
jawab:
vt = vo + at
20m/s = 0 + a(30s)
20m/s = 30s(a)
20/30 = a
a=2/3 m/s²