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P-t graph velocity HELP!

  1. Sep 6, 2015 #1
    1. The problem statement, all variables and given/known data

    Take the slope of the curve in the figure to determine the velocity at t = 10.0 s, in meters per second.
    vujobm3j.1qv.png

    2. Relevant equations

    (y2-y1)/(x2-x1)



    3. The attempt at a solution

    I don't know how to find it at 10 because there isnt a point plotted at 10. I did the two points near it and got it 1.04 by using the above slope equation.
     
  2. jcsd
  3. Sep 7, 2015 #2

    RUber

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    I don't see how you could have gotten close to one. Velocity is change in position per unit time. You are given the data points and the plot. Looking at the plot, it is just about a straight line, so you could potentially use any points given to find the slope, but since 10 is so close to 9.7, I would recommend the points before and after 9.7 sec to use for the estimate.

    Also, note that position data is given in km and the problem asks for velocity in m/sec.
     
  4. Sep 7, 2015 #3

    andrevdh

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    Best shows us how you got to the answer, because I get a completely different one.
     
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