This is a problem from my Calculus class in the sections about vectors. 1. The problem statement, all variables and given/known data Two forces F1 = 2i + 6j and F2 = 2i -2j act on an object. What additional force is needed to keep the object at rest? 2. Relevant equations I'm not sure where to start. 3. The attempt at a solution I know for the body to be at rest it has to equal 0. I've tried finding the displacement between the two given vectors which gives me <0, 81>. I'm not sure if that is even relevant. The only thing I really get right now is that something has to equal zero. I feel like this is an easy problem but I don't know where to get started.. thanks in advance.