I am the OP in question and I feel like I should post some clarifications, since some people seem to be jumping to even further conclusions than I did in the post. I don't think there is anything non-mainstream about my question, it was mostly a question about sloppy maths and I was well aware that I was in the wrong when I posted it but couldn't see why mathematically. I deliberately used a provocative wording to attract good replies, but had I known it would attract that much attention, I would not have posted it at all. I use physics for a living and I am well aware of the meaning of these equations (and the correctness of physics) but I was just confusing myself over something trivial and decided to ask other people instead of agonising over my bad maths.
The original post never really implied that "physics is wrong". It asked whether this silly equation reflects something deeper about classical mechanics - and we do know that classical mechanics is not a complete description of nature - again purely as speculation and I didn't think much of it. Again, had I known that this would cause so much upset, I wouldn't have included it.
Finally, I would also like to point out that unless the question is obviously anti-science, it benefits everyone to treat even the silliest-looking questions seriously. After all, if they are so obviously wrong, then they should be very easy to disprove. It seems that some people regard questions on everything that they have understood well as trolling / questions that should be censored, and this is in my view not a productive way to look at things, especially on a website made for people asking questions on things they don't understand sufficiently.
The moral of the story is that one should be very exact and careful when asking questions without being too provocative, but also that one should answer questions with an open mind, unless there is overwhelming evidence to the contrary, in which case the question should be marked as non-mainstream.