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Velocidad inicial= 45km/h = 12.5m/s
a= -0.50m/s
d= vt + 1/2at cuadrado
d= 12.5*25 + (1/2)(-0.50)(25)cuadrado
d= 312.5 + 156.25
d= 468.75m
t= vf-vo / a
t= -12.5 / -0.50
t= 25s