All, I am an avid kayaker, and recently got into an argument with another kayaking friend of mine over (what I think is) an issue of relative velocity. The question was this: A person is sitting in a kayak and that kayak is in a constant velocity current (say, 3 knots), but the kayak is not moving relative to the water it is in. If he falls out of the kayak, at what speed will the person and boat separate? My argument was that they will not separate; they will both continue to move at 3 knots with the current, but will not move relative to the water. Can anyone help settle this? Thanks!