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The French National Railroad holds the world's speed record for passenger trains in? 
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#1
Sep1407, 11:35 AM

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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
Sep1407, 11:37 AM

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P: 8,325

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?



#3
Sep1407, 11:42 AM

P: 9

i need some help setting up the problem. I dont unders the horizontal and vertical componenets. Also what formula do i use?



#4
Sep1407, 11:47 AM

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P: 8,325

The French National Railroad holds the world's speed record for passenger trains in?
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.phyastr.gsu.edu.../mot.html#mot1
Now, can you pick one of these equations to use? 


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