OOOEEPS, you are wrong
At sea-level, f.i. in the Netherlands ... NO MORE than 600KPH (argument 1 out of 10)
The speed of sound at sea-level is 1,200KPH
YOU better can make another choice

Question FOUR of four questions

I am VERY SURE that the SOUND-BARRIER is BROKEN at sea-level by a man

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I am NOT so SURE that the SOUND-BARRIER is BROKEN at sea-level by a man

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