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V/T graph to P/T graph

  1. Oct 3, 2013 #1
    1. The problem statement, all variables and given/known data
    I have to calculate the displacements from a velocity-time graph to make a position-time graph.
    The velocity-time graph from the question is attached.

    2. Relevant equations
    d=vt


    3. The attempt at a solution
    To calculate the values for a position-time graph, I first converted all the velocities from km/h to km/min to match the time.
    The truck travels at 70 km/h (1.16 km/min) for 10 mins: 1.16 x 10 = 11.6
    It then travels at 80 km/h (1.33 km/min) for 30 mins: 1.33 x 30 = 40
    It then travels at 75 km/h (1.125 km/min) for 5 mins: 1.25 x 5 = 6.25
    It then travels at 60 km/h (1.0 km/min) for 2.5 mins: 1.0 x 2.5 = 2.5
    And then travels at 55 km/h (0.9 km/min) for 22.5 mins: 0.91 x 22.5 = 20.6

    I drew a position-time graph which is attached. I just want to know if I did this right because the graph I made looks a little weird to me.
     

    Attached Files:

    • 2.jpg
      2.jpg
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    • 1.jpg
      1.jpg
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  2. jcsd
  3. Oct 3, 2013 #2

    phinds

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    2016 Award

    Since the truck keeps traveling in the same direction, how is it that your position graph shows it reversing direction?
     
  4. Oct 3, 2013 #3
    Ah, I think I've got it now. Does this look right?
     

    Attached Files:

  5. Oct 3, 2013 #4

    phinds

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    2016 Award

    I didn't check the details but that's certainly the right idea.
     
  6. Oct 4, 2013 #5
    Ok, thanks!
     
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