The asker posted a question to which I responded with an explanation, an illustration, and a proof of concept. The asker expressed doubts about the answer despite proof. The answer was later down-voted by someone else, with the askers doubtful comment getting an up-vote. This is a question regarding physics and illustration clearly proves my answer as being correct.
The asker revealed further requirements after a discussion, so I posted a new answer taking the new requirements into account. I left my original answer as it correctly addresses the original question.
Another commenter believes the answer is an "over simplification", however almost all physics equations are simplified in programming, or rather, calculated with only as much accuracy as required. I could have included a fully physically correct answer, but my answer addressed exactly what the asker wanted.
I'm fairly new to Stack Overflow so I don't know if this sort of behaviour is tolerated, or accepted, or maybe even encouraged? As a contributor its very demotivating to spend time answering questions only to have the effort go unrecognised, or marked as "wrong" simply because an ignorant person doesn't "believe" the answer. Is this something that can be expected to happen often?