Jawabanmu

2014-08-25T21:10:46+07:00
Rumus percepatan : a = v/t V=72 km/jam = 20 m/s = 72 x 1000/3600 = 20 t=30s 20/30= 2/3 m/s (s pangakat 2) Maaf klo salah,smoga membantu!!