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What the first man-made object to break the sound barrier?
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do you mean...
what "was" the first man-made object to break the sound barrier???

cuz if it is then my guess is that the answer is a sneeze...lol
oh didnt see that....and nope thats not it
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is it someting that come out of a human???
cuz if it is not then that will eliminate 3 answers.
it does not come out of a human
Sound?
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DUH!!!!!!! A whip!