I don’t Think a human body could break the sound barrier because its not aerodynamic enough to do it any more than the P51 mustang could break the sound barrier.
The P51 was just Not designed to do it.The only way aircraft can do it is with swept back wings.
No Matter his jumping altitude he will never break the sound barrier.
Pardon the spelling errors in my previous entry.
I don't agree. At very high altitude, there's little air and therefore little air resistance; terminal velocity is much faster than the 120 mph attained down here. Above some altitude, terminal velocity for a human will exceed the local speed of sound. He's jumping above that altitude.