It varies, so depends how fast he was going and where it was: http://en.wikipedia.org/wiki/Speed_of_sound#Altitude_variation_and_implications_for_atmospheric_acoustics
I think he made 726 mph (324 m/s), maybe more, and fell from nearly 40km up, so if the atmosphere was close to standard, then yes, it looks like he went supersonic. Wonder if observers on the ground detected a sonic boom?
@moth started
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I think he made 726 mph (324 m/s), maybe more, and fell from nearly 40km up, so if the atmosphere was close to standard, then yes, it looks like he went supersonic. Wonder if observers on the ground detected a sonic boom?