How to get velocity and position from an acceleration-time graph?

  1. Sep 5, 2009 #1
    Consider the plot below describing the acceleration of a particle along a straight line with an initial position of 10 m and an initial velocity of 9 m/s.

    [​IMG]

    1. What is the velocity at 7 s?
    2. What is the position at 7 s?
     
  2. jcsd
  3. Sep 5, 2009 #2
    Please help me! I got the answer -12 for #1 and -0.5 for #2, but the computer's telling me these are wrong (it's an online worksheet). I don't understand why?
     
  4. Sep 5, 2009 #3
    Well you can use the two default equations.
    [tex]v=v_o +at[/tex]
    [tex]x=v_ot+\frac{1}{2}at^2[/tex]
    You'll have to use each equation twice for each problem though.
     
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