Jawabanmu

2014-08-25T18:42:55+07:00
Kecepatan awal= vo= 0m/s
vt = 72km/jam=20m/s
t=30s
a=?
Jawab:
vt = vo + at
20 = 0 + a(30)
20 = 30a
20/30 = a
a = 2/3 m/s² = 0,67 m/s²