Overhead(camera on cable)shot, any motion analysis software.
There could also be some feedback from the camera rolling along side the track over the 100m straight i.e. between a “camera log” and motion analysis it should work.
An overhead camera wouldn’t work too well unless it was completely stationary over each split point. That would work pretty well. If you’re going to use moving cameras on a track they really need to be from the side and be relatively matched with each person or I suspect you’d get huge perspective errors.
The problem with taking 10m splits on the 100m is that slight errors of 0.01-0.02 can make the subsequent splits anomalous if you don’t catch it.