Interesting stuff. Do you have any insights as to why swipes with very long displacements tend to be slower than medium-length swipes?
Some users would choose to make long conclusive swipes, rather than short flicks. The swipes with very long displacements are only achieved by people taking the time to make a slow calculated gestures. Also key to note here is that we're tracking the final velocity of the strokes, rather than the overall velocity.