Jawabanmu

2014-06-13T10:39:36+07:00
Vt = Vo + a X t 
54 = 18 + a X 10
54 = 18 X 10
     = 0,3 (Km/jam)
3 3 3
2014-06-13T10:44:00+07:00
Vo = 18000:3600=5m/s
vt = 54000:3600=15m/s

vt= vo+at
15=5+10a
15-5=10a
10a=10
a=1m/s²
5 2 5