New high jump record

[MartG]

BGARK said:

Flat6er said:

a small sonic boom heard by observers on the ground.

At what height and how did they hear this I wonder?

Wouldn't he have slowed down when hitting thicker atmosphere to the point where he would have been travelling below sonic speeds?

True - surely heading vertically downwards the sonic shockwave would be propagating horizontally so wouldn't be heard on the ground ?