Hi, I have seen a discussion similar to the question I am asking right now on the forum before, but I did not understand it and do not know if a conclusion was reached. In F = ma, F, or force net, is a vector and acceleration is a vector. When solving for m, or m = F/a, you are dividing two vectors. Many websites have told me that vector division is "undefined." Can someone please explain thoroughly but simply how this makes sense and how to approach my situation with m = F/a.