Jawabanmu

2014-08-27T14:44:41+07:00
V0 = 20 m/s
vt = 0 m/s
a = (vt-v0)/ t
a = -20 / 10
a = -2 m/s2

artinya mobil mngalami prlambtan sbesar 2 m/s2
2014-08-27T14:59:22+07:00
Vt = v0 + a.t
0 = 20 + a.10
-20 = 10a
a = -20/10 = -2 m/s² (tanda - berarti mobil mengalami perlambatan)