- #1
zdickz
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Homework Statement
A truck tractor pulls two trailers, one behind the other, at a constant speed of 100 km/h. It takes 0.610 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?
d = 390 m
v of combo = 100km/h = 27.78 m/s
Homework Equations
Total time equals the time to cover the distance of 390 m plus the time for the truck to pass onto and off of the bridge. So...
The Attempt at a Solution
390 m / 27.78 m.s = 14.04 s + 2(0.610) = 15.3 s
I got credit for the problem from webassign, but they have an answer of 14.7 s as the true answer. What can I do to improve my accuracy?
Thank you in advance.