un tren de 46 metros de longitud se desplaza con velocidad contante de 108km/h determine el tiempo que empleara en cruzar completamente un tunel de 404 metros de longitud
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Para que cruce totalmente el túnel el tren debe recorrer una distancia de
46 + 404 = 450 metros.
Luego siendo d = V . t es t = d / V
V = 108 km/h = 30 m/s
t = 450 m / 30 m/s = 15 s
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