Train Physics Problem

  • Thread starter Physuph
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  • #1
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Homework Statement



A given train can stop in t seconds when it is running at its maximum speed. The train driver sees a car stalled at an intersection that is d1 meters ahead of the train, and instantly pulls the brake starting while at its maximum speed. The train reaches the intersection u seconds later, but does not hit the car because the car darts out of the way at the last moment. The train travels d2 more meters before it comes to a complete stop.

Supposing that the train's acceleration through all this is constant, how far was the train from the car? In other words, what is d1? (in terms of t, u and d2)


Homework Equations



v=v0 + at
vav= (1/2)(v0+v)
etc...

The Attempt at a Solution



I have a bunch of equations and I can't seem to put them together to find the solution.
 

Answers and Replies

  • #2
Redbelly98
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Science Advisor
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Think in terms of a, Δv, and Δt, and see if you can set up some equations.
 

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