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Help with Acceleration

  1. Sep 7, 2009 #1
    1. The problem statement, all variables and given/known data
    The figure shows the motion diagram, made at two frames of film per second, of a ball rolling along a track. The track has a 3.0m-long sticky section.
    [​IMG]
    http://img30.imageshack.us/img30/2278/screenshotkh.png <-- The graph with the coordinates
    2. Relevant equations
    a=v/t


    3. The attempt at a solution
    a=1.98-0/1.5-1
    =3.96
    a=3-2/2-1 = 1 + 3.96

    I've tried a bunch of ways but could not get it
    [
     
  2. jcsd
  3. Sep 7, 2009 #2
    You are asked to figure out the acceleration of the ball in the sticky section of the track.

    (1) First determine the initial speed [itex] V_i [/itex]?
    (2) Then determine the final speed [itex] V_f [/itex]?
    (3) What is the distance [itex] x [/itex] over which this change in speed occurs?
    (4) Have you learnt a formula which relates these three quantities? The formula
    I am thinking of is [tex] V_f^2 - V_i^2 = 2 a x [/tex]. Then use this formula and
    and ask your teacher if it is legitimate to do so.
     
  4. Sep 7, 2009 #3
    Ok, I got it. Thanks!
     
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