1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Tranlastion Motion

  1. Sep 13, 2007 #1
    1. The problem statement, all variables and given/known data
    A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward one another along a straight, level track. When they are 950 km apart, each engineer sees the other's train and applies the brakes. The brakes decelerate each train at the rate of 1.0 m/s^2. Is there a collision? If so, what is the speed of each train at impact? If not, what is the separation between the trains when they stop?

    2. Relevant equations
    x=x0 + v0T + (1/2)(x - x0)

    3. The attempt at a solution
    I tried using the above equation, but I could not get a reasonable answer. I changed everything to meters and seconds. Here are the changes for those units:

    95 km = 950,000 m
    221 km/h = 61.39 m/s
  2. jcsd
  3. Sep 13, 2007 #2
    Just split it into two equations, and find the distance it takes to stop each one.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Tranlastion Motion