So, he is going to go from 0 to 690mph in 35 secounds?!
When he breaks the sound barrier. Every organ in his body will explode.
Yep. What a loon.
The speed of sound is not constant. It is faster in denser air and slower in less dense air. Basically, that 690MPH figure is only at low elevations...much slower than that at very high altitudes.
Havn’t you ever noticed at high elevations, like on a mountain, you see things before you hear the sound they make? Like someone dribbling a basket ball say 35 yards away at elevations over 5000feet. You hear the ball hit the pavement about the same time you see the ball half way between the person’s hand and the pavement.
Yep ... 32 ft/s/s adds up.