How Many G's Will the Hyperloop Pull in Its Next Test?

Is Elon Musk crazy or just awesome? This week, the serial CEO (Tesla, SpaceX, Neuralink) posted on Twitter about yet another one of his ventures, the super fast tube-based transportation system called hyperloop. https://twitter.com/elonmusk/status/982826517443915776Is this even possible? Let's do some quick calculations. First, what is the speed of sound? I am assuming that Elon is referring to the speed of sound at sea level (and not speed of sound in a low pressure tube).

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