Jawabanmu

2013-12-03T18:56:07+07:00
V1= 15 km/jam ; V2= 45 km/jam ; t= 12 s = 12/3600 jam= 1/300 jam
cari dulu percepatan (a) = (V2-V1) /t = (45 - 15 km/jam) / (1/300 jam) = 9000 km
jarak (x) = Vot + 1/2 at^2 = (15)(1/300) + 1/2 (9000)(1/300)^2 = 0,1 km

2013-12-03T18:56:53+07:00
Dik :
Vo= 15 m/s
Vt= 45 m/s
 t= 12 sekon
ditanya; s = ..?..
jawab :
cari a dahulu
-> a= v: t 
    a= (45-15) : 12
    a= 30: 12= 2,5
S= Vo.t + 1/2 a  t^{2}
S= 15. 12 + 1/2 . 2,5 . 144 = 180 + 2,5 . 72
S= 180 + 180
S= 360 km

semoga membantu OwO)/
sorry mba kan harusnya pake m bkn km,di sederhanain dulu
waduh.. ahaha.. iya, kurang teliti...
makasih ya... ^eO)//