Please help me with a physics problem (acceleration)?

A freight train has a mass of 1.7x10^7 kg. If the locomotive can exert a constant pull of 8.4x10^5 N, how long does it take to increase the speed of the train from rest to 84 km/h?

I've looked in my physics book and cant figure out what equations to combine to figure this out! help please

1 Answer

  • Anonymous
    1 decade ago
    Favorite Answer



    a = 0.0494 m/s^2

    84km/hr / 3.6 = 23.33m/s.

    a = (v_f-v_i)/t


    t = 23.33/0.0494

    = 472 seconds.

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