This only holds true while speed is constant. If there is any acceleration, the math gets a little more complicated, but it is a good place to start and get a figure for total rotation. If you want to be real precise you would need to get distance travelled each frame and find the angle of rotation that would give you the corresponding arc length. It’s possible to automate this (and many good rigs will), but the point of the exercise here is to train your eye.
