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What is “obvious” is a fine point and university students still struggle with knowing what is appropriate.

For a simple distance, speed, time calculation I would expect a good student to write the units so that it’s obvious by dimensional arguments. Moreover I’d argue it takes little more effort to write eg v = d/t = …

People really underestimate the importance of clear communication and scientific clarity. A student who understands the subject deep enough to clearly communicate it is likely a top student. It’s one thing to cite that formula. It’s a whole other thing to explain its derivation or to understand that for large values of ‘c’, the formula approaches the classical limit. In these jokes, there is never a well-written response because of there were, it would diminish the shock.

Of course the whole thing is a joke, but behind the scenes, the fact that the normal person lacks an understanding of what is actually important here (the ability to communicate) leads to the mess of abilities at the university level.

It’s a perpetuation of the idea that there are these little child geniuses that outsmart their teachers. Then these little geniuses graduate high school, and realise they never actually understood the subject at anything more than a superficial level.