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Por dato: Vo = 30km/h = 30(1000m/3600s) =25/3 m/s
Vf = 0m/s ("El vehiculo se debe detener")
t = 12s
Reemplazando datos:
d = (25/3 m/s + 0m/s)(12s)/2
d = 50 metros ← Respuesta
Eso es todo!! Saludos :) Jeizon1L