Hopefully he will break the sound barrier while the atmosphere is thin enough. Once he gets to a certain altitude the atmosphere is going to act like one mother of a brake.
I wonder if the thin atmosphere will slow the speed of sound (less than 340.m.s). It could be that in the thin atmosphere the speed of sound could be much slower due to the lower atmospheric pressure.
Checking******
Wikipedia Speed_of_sound
Yup, the speed of sound at 29Km is 301.m.s. A little, but probably not enough to make a difference.
S&F
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