I guess this is going to be my worst thread. I'm so sick of this stupid concept "relative velocity" that i'm in no mood to present this thread in my "exemplary style" for which i have been included in the "best homework threads" section. I'm sorry for that, but its true. I have no problems regarding relative velocity in one-dimension, thats quite simple. But this relative velocity concept in two-dimensions is really really confusing specially when it comes to solving problems. Believe me or not, i have been trying to understand this concept for the past almost one year or so. But its impossible. I have never faced such a problem in my life, and i guess i wont face it in future either. I'm so agitated that i now go around saying that even if i become one of the greatest physicists in the world, even then i will not be able to do problems from one chapter- and that is relative velocity. I understand all other concepts and dont have much trouble solving problems from other chapters myself(and ofcourse with PF help at times, thanks for that). But i am not even able to solve the simplest problems of this "relative velocity". I'll explain my problem in detail. See, i do understand the theoretic part, somewhat. But whenever i sit down to do problems, i have varied difficulties and am unable to solve them. I have gone thru many books and solved exaples but still dont get it. each problem seems to pose more problems and they seem to be done differently from each other. I have so many ... anyway here i'll just post a few: "Rain is falling vertically with speed 4m/s and the man is moving due east with a speed 3m/s. with what speed the rain appears to be coming to man and where should he hold the umbrella to protect himself from rains?" QUESTIONS THAT TROUBLE MY MIND: (1) what should be the vector relation or equation? (2) Is it v(man wrt ground) + v(rain wrt ground) = v(rain wrt man) ? (all r vectors ofcourse). Again there is this weird swimmer problem, shortest path, shortest time, all that crap. I cant even form the equation. If only i can form the equation, then only will i resolve the vectors along chosen axes and then find the answer. but i cant form the vector relation. whose velocity with respect to whom plus whose velocity wrt whom will i add? Its all too confusing, even i cant explain my problem. This is the worst topic in physics. No other concept in the world is as confusing as "relative velocity". I feel suicidal. Please please help me, i beg u. Once again sorry for not presenting my thread well, as always. But i promise that i'll be back with my well organised threads as soon as i understand this concept. If PF cant explain it, then no one on earth can. Thanks a lot.