# Help with Acceleration

1. Sep 7, 2009

### Mirole

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.

http://img30.imageshack.us/img30/2278/screenshotkh.png [Broken] <-- 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
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Last edited by a moderator: May 4, 2017
2. Sep 7, 2009

### loveequation

You are asked to figure out the acceleration of the ball in the sticky section of the track.

(1) First determine the initial speed $V_i$?
(2) Then determine the final speed $V_f$?
(3) What is the distance $x$ 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 $$V_f^2 - V_i^2 = 2 a x$$. Then use this formula and
and ask your teacher if it is legitimate to do so.

3. Sep 7, 2009

### Mirole

Ok, I got it. Thanks!