This is, technically, an xkcd forum.
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Title text: Now I'm tempted to start telling people that I secretly don't actually know how to do any physics calculations, and so all the answers in What If are based on me actually trying to do the thing and then reporting what happened, but phrased as if it's hypothetical.
Wait, I was assuming he did do it all! Next he'll be telling us that xkcd itself isn't autobiographical!