1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Uniform acceleration question

  1. Feb 13, 2012 #1
    1. The problem statement, all variables and given/known data

    a train starts from station a with a uniform acceleration of 5.00 x 10^-1 m/s^2 (east) and attains full speed after 50.0s. It travels at full speed for 1.20 x 10^2 s, then is brought to rest at station b by the application of the brakes which produces a constant acceleration of -2.50 m/s^2 (east). find the distance between station a and station b

    3. The attempt at a solution
    i tried adding station a and b's displacements but it didn't add up to 3.75x10^3 m (the answer)

    i got station a's displacement by finding vfinal then using d=vft-1/2at^2 and added that to the other displacement and yea didn't work.
     
  2. jcsd
  3. Feb 13, 2012 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Draw the v-t graph - the displacement is the area under the graph.
    Note: considering the stations are not moving, both their displacement's are 0.
    Station a will be at position x=0m.

    In the first stage of the journey, you need to find the final speed.
    In the last stage you need to find the time to decelerate to rest.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Uniform acceleration question
Loading...