Physics

A truck tractor pulls two trailers, one behind the other, at a constant speed of 100 km/h. It takes 0.640 s for the big rig to completely pass onto a bridge 390 m long. For what duration of time is all or part of the truck-trailer combination on the bridge?

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asked by Joli
  1. please show work

    posted by Joli
  2. 100km/h = 27.78m/s

    390m / 27.78m/s = 14.038s

    14.038 + 0.640s = 14.679s

    posted by Joli
  3. The length of the tracktor with two trailers is
    d=v•t= 27.78•0.64 = 17.78 m.
    L=l+d=390+17.78=407.78m
    Δt=L/v=407.78/27.78=14.68 s.

    posted by Elena

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