How Does the Tesla Roadster Sort of Fly?

That's exactly what the Tesla Roadster uses.

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and you have a compressed air tank in there, which it does,

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there's going to be a change in velocity,

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and an acceleration for that air going down.

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So let's call this the force the car exerts on the air FC.

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Newton's third law says that forces come in pairs.

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They're always an interaction between two objects.

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the air has to push back on the car,

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and that would be in the opposite direction.

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So this is the force the air pushes on the car.

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Now, if you get that force of the air

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pushing the car equal to the gravitational force,

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If the force is greater than the gravitational force,

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If the force is less, it will increase the speed down.

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It's exactly the same as a rocket does in space,

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except that uses a chemical reaction

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to shoot stuff out the back of the rocket

Original source: https://www.wired.com/