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Distance and time between 2 train stations

  1. Sep 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A light-rail train going from one station to the next on a straight section of track accelerates from rest at 2.27 m/s2 for 15.7 s/ It then proceeds at constant speed for 1346 m before slowing down at 2.2 m/s2 until it stops at the station. What is the distance between the stations? and How much time does it take the train to go between the stations?

    2. Relevant equations
    I figured if i used A=v/t i could get v which i could plug into V=x/t and then get X being the distance in the start and then the distance in the middle would just be 1346 since it was given . having trouble figuring out how to get the last one

    and for the time
    i would think to use Δt=Δv/a

    3. The attempt at a solution
    ok so i got V= 35.639, and X to equal 559.5323
    would the formula to find the stopping distance be Vf^2-Vi^2/2*(-2.2)????
     
  2. jcsd
  3. Sep 5, 2008 #2

    LowlyPion

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    Yes. Looks like you are on the right track.

    I think your first distance is off though by a factor of 2.
     
  4. Sep 5, 2008 #3
    for my distance i get 2194.2001 m
    and they said it was wrong so where do you think i went wrong??
     
  5. Sep 5, 2008 #4

    LowlyPion

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    I think your first distance is off though by a factor of 2. Did you catch my quick edit?
     
  6. Sep 5, 2008 #5
    lol no but thanks for helping me out ur really good at this
    i got it now


    Thank u soo much :smile:
     
  7. Sep 5, 2008 #6

    LowlyPion

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    Happy to help.
     
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