Jawabanmu

2014-09-02T20:59:07+07:00
72 km/jam = 20 m/s
Vt = V0 + (a * t)
20 = 0 + (a * 5)
20 = a * 5
20/5 = a (baca: 20 per 5)
4 = a
Percepatan = 4 m/s²