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Ex. three successive position data points:
...and the corresponding velocity data points - note the zero value in the middle: 
These jumps in velocity values result in acceleration values that oscillate from negative to positive to negative and so on. We need a smoother graph of acceleration.
EDIT: This redundancy problem is easily solved by changing the frame step size to 2 or 3 (located to the right of the frame slider, underneath the video display).