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Calculate Velocity from a P vs T graph

  1. Jul 5, 2012 #1
    1. The problem statement, all variables and given/known data

    What is the velocity of the object at t=2.5 s?
    Please see attached graph.


    2. Relevant equations
    v = d / t


    3. The attempt at a solution

    v = -30cm / 2.5 s = -12cm/s

    key gives correct answer as -60cm/s, but I can't figure out how to get that answer. Please help!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

    Last edited: Jul 5, 2012
  2. jcsd
  3. Jul 5, 2012 #2
    Hi twalk353! Welcome to PhysicsForums :smile:

    To find the velocity, you need to find the slope of the curve at that point. How would you do it?
     
  4. Jul 5, 2012 #3
    Hi Infinitum! Thank you...

    Eureka! That simple...I knew I was over looking some thing very easy.

    slope = rise / run -or- y2-y1 / x2-x1

    (x1,y1) could be (1.5,30) or (2,0) and (x2,y2) could be (2.5,30)

    Then plug in...
    -30-0 / 2.5-2 = -60cm/s!!!

    Thank you for your help!
     
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