I studied physics in undergrad and in classical dynamics we covered “rocket science” in these terms. The term is more or less a misnomer as science implies trying to understand how the universe works. Building rockets is engineering but studying their motion does rely on both the equation I gave above and also on fluid dynamics. From the point of view of “science” it is pretty simple. From the point of view I’d actually building a rocket the engineering is very hard. Since that time I’ve always had a bit of a chip on my shoulder about the “it’s not rocket science”. It also doesn’t help that both my parents studied aerospace engineering in undergrad and grad school and tried to impart a decent chunk of it on my as a kid (which I resisted very hard).