YOU SAID:

if everybody said yes at the same time would it break the sound barrier

INTO JAPANESE

誰もが同時に「はい」と言ったら、それは音の障壁を破るだろう

BACK INTO ENGLISH

If everyone said yes at the same time, it would break the sound barrier

INTO JAPANESE

誰もが同時に「はい」と言えば、それは音の障壁を破るだろう

BACK INTO ENGLISH

If everyone says "yes" at the same time, it will break the sound barrier

INTO JAPANESE

誰もが同時に「はい」と言うと、それは音の障壁を破るでしょう

BACK INTO ENGLISH

If everyone says "yes" at the same time, it will break the sound barrier