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[1D kinematics] Car problem: Solving problem with a graph

  1. Oct 26, 2009 #1
    1. The problem statement, all variables and given/known data
    A car starts from rest and accelerates uniformly for 200m. It moves at constant speed for 160m and then decelerates to rest in 50m. The whole trip takes 33s. How long did it move at constant speed? (hint: draw the v versus t graph).


    2. Relevant equations
    kinematics equations
    and the graph is used


    3. The attempt at a solution
    I drew the graph which looks like a trapezoid... but I don't know what to do after that.
     
  2. jcsd
  3. Oct 26, 2009 #2

    Delphi51

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    Homework Helper

    Delightful to see your teacher using the graphing method instead of just formulas all the time! Do you know how to put the distances on that graph? Got the constant speed level marked with a "v" or something? The method usually involves writing formulas for the areas. Once you have them written up you'll probably see how to finish it.
     
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