[Dot Product] Vector Projection 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a solution I am not sure what to do here -- I know that the projection of u onto a "dotted" with w = 0 by definition, but I don't know how to show this. added this second part after plugging in for the definition of the projection we derived in class, then simplified. . .