Acceleration Homework Help: Motion Diagram and Sticky Track Analysis

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Homework Statement


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.
02.P24.jpg

http://img30.imageshack.us/img30/2278/screenshotkh.png <-- The graph with the coordinates

Homework Equations


a=v/t


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
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Discussion

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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 learned 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.
 
Ok, I got it. Thanks!