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vf=vi+a*t ---> vi=vf-a*t
vf=90km/h ---> 25m/s
vi=25m/s-2m/s^2*4s=17m/s
Para la distancia
d=vi*t+(a*t^2)/2
d=17m/s*2s+(2m/s^2*4s^2)/2=38m