Roscoe G. Little

Can differential equations be used to solve such a problem? I understand that this topic is more related to physics, but I am sure that mathematics is indispensable here. I often use https://plainmath.net/post-secondary/calculus-and-analysis/differential-equations when I need help with various tasks. I know I can always get free solutions to bivariate data questions, but I'm wondering how you would represent the solution to this problem with an equation.

This is a very good book, I have been working with it for a long time.