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The French National Railroad holds the world's speed record for passenger trains in?

  1. Sep 14, 2007 #1
    The French National Railroad holds the
    world's speed record for passenger trains in
    regular service. A TGV (tres grand vitesse,
    or very great speed) train traveling at a speed
    of 325 km/h requires 1.35 km to come to an
    emergency stop.
    Find the braking acceleration for this train,
    assuming constant acceleration. Answer in
    units of ms^2.
     
  2. jcsd
  3. Sep 14, 2007 #2

    cristo

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    Welcome to the forums. For homework/coursework type questions you must show some work before we can help-- forum rules. So, what thoughts do you have on the question?
     
  4. Sep 14, 2007 #3
    i need some help setting up the problem. I dont unders the horizontal and vertical componenets. Also what formula do i use?
     
  5. Sep 14, 2007 #4

    cristo

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    Staff Emeritus
    Science Advisor

    Well, there are only horizontal components in this question. You are told an initial velocity, a stopping distance, and a final velocity. You are also told that the acceleration is constant, and thus you are indirectly told to use the kinematic equations for constant acceleration. See this webpage for a list of the equations http://hyperphysics.phy-astr.gsu.edu/hbase/mot.html#mot1

    Now, can you pick one of these equations to use?
     
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