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I don't know the shutter speed at which the images were taken, so I have to calculate it, and then it gains me nothing new. For the movement I measured from the front in one image to the fornt in the other, then from the back of the blur in one image to the back in the other. I averaged the two distances and got the distance traveled.
Even if I knew the shutter speed, I could not know the angle of the puck, and that would affect its length in the pictures.
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