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d=200km----------m=200000m
Vi=15m/s
Vf=120km/h---------m/s=33.3333/s
...Solución...
Vf^2=Vi^2+ad
a=(Vf^2-Vi^2)/2d
a=[(33.3333)^2-(15)^2]/2(200000)
a=[1111.10-225]/400000
a=886.10/400000
a=0.002215m/s^2
Vf=Vi+at
t=(Vf-Vi)/a
t=(33.333m/s-15m/s)/0.02215m/s^2
t=18.3333/0.002215m/s^2
t=8276.5s
Me sale esta respuesta creo que es por los decimales...