Jawabanmu

2014-08-25T20:05:32+07:00
Vo : 0 km/jam = 0 m/s
vt : 72 km/jam = 20 m/s
t : 30 s

a :  \frac{vt - vo}{t} =  \frac{20 - 0}{30} =  \frac{2}{3} m/s²