I don’t much about physics however, don’t you have to fly (or fall) faster than about 700 MPH, to break the sound barrier? If he’s able to reach that speed (I’m not sure how given friction, gravity, etc.) unless he’s able to make it happen before entering the earth’s atmosphere which will slow his descent dramatically. Anybody care to shed light on this latest Guinness Book attempt to create or break a record?
The air is thinner up there, causing two things to be different: a lower friction on him, and the “speed of sound” is slower.