>> it looks like each frame has the fragment at about 3 feet from its last position How did you arrive at this number? What distance do you estimate between th

>> it looks like each frame has the fragment at about 3 feet from its last position How did you arrive at this number? What distance do you estimate between the camera and the falling rock? > If that's a 60fps camera (I think it is?), that's 180 f/s speed or 122mph. Are you assuming the skydiver is stationary?