Breaking Records: French National Railroad's TGV Acceleration

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Homework Help Overview

The discussion revolves around calculating the braking acceleration of a TGV train, which is known for its high-speed capabilities. The problem involves understanding the relationship between speed, stopping distance, and acceleration under the assumption of constant acceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are discussing how to set up the problem, with some expressing confusion about the components involved and the appropriate formulas to use. There is a focus on identifying relevant kinematic equations for constant acceleration.

Discussion Status

The conversation is ongoing, with some participants providing guidance on the components of the problem and suggesting the use of kinematic equations. There is an emphasis on ensuring that the original poster shows their work in accordance with forum rules.

Contextual Notes

Participants are navigating the constraints of homework guidelines that require showing work before receiving assistance. There is also a mention of the need to clarify the horizontal components relevant to the problem.

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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.
 
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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?
 
i need some help setting up the problem. I don't unders the horizontal and vertical componenets. Also what formula do i use?
 
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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