Fair question. My assumption is that the US schools offer students enough exposure and resources of advanced topics, to the point that top students will find th

Fair question. My assumption is that the US schools offer students enough exposure and resources of advanced topics, to the point that top students will find their way. For instance, libraries, vast resources on the internet, community colleges, programs with local universities, and etc. The assumption can be challenged, of course. Case in point, this problem on Stackexchange was from a high-school homework. I think it's advanced enough for students: https://physics.stackexchange.com/questions/711174/calculating-the-displacement-of-particle-as-a-function-of-time https://physics.stackexchange.com/questions/711174/calculati...