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Morrison
Lv 6
Morrison asked in Ciencias y matemáticasFísica · 4 years ago

¿El conductor de una motocicleta se mueve a una velocidad de 72 km/h ve a una distancia el semaforo en rojo, reduce su velocidad...?

reduce su velocidad a razon de 5m/s*2

¿Que distancia recorre hasta detenerse? b) ¿Que tiempo le tomara detenerse?

1 Answer

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  • Ana Belén
    Lv 7
    4 years ago

    72 km / h * 1000 m / km = 72.000 m / h

    72.000 m / h / 3.600 s / h = 20 m / s

    Esto es lo mismo que dividir por 3,6

    72 / 3,6 = 20 m / s

    Vf = Vi - a * t

    0 = 20 - 5 * t

    - 20 = - 5 t

    t = - 20 / - 5 = 4 s

    s = Vi * t - ( a * t^2 ) / 2

    s = 20 * 4 - ( 5 * 4^2 ) / 2 = 80 - 40 = 40 m

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