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DISPLACEMENT-TIME graphs question

  1. Jan 22, 2015 #1
    1. It's a displacement time graph with coordinates (0,0), (3,-3),(5,-3), (9,5) The lines are all linear.
    The question first asks 'Calculate the velocity for each section 0-3s, 3-5s,5-9s. I know how to do that part (it's -1m/s, 0m/s, and 2m/s).
    But the other part of the question asks: What distance has been travelled in 9s?
    How can I find the distance travelled in the total 9 seconds with a displacement/time graph??
    (By the way, displacement is the y-axis, time is the x-axis)
  2. jcsd
  3. Jan 22, 2015 #2
    I'm sure you know this equation
    and just do it in sections
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