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

Relevance
  • Anonymous
    1 decade ago
    Favorite Answer

    F=ma

    8.4*10^5=1.7*10^7*a

    a = 0.0494 m/s^2

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

    a = (v_f-v_i)/t

    0.0494=23.33/t

    t = 23.33/0.0494

    = 472 seconds.

Still have questions? Get your answers by asking now.