1. The problem statement, all variables and given/known data This is the graph of v against u . i am having problem of getting the shape of graph and getting the point (2f, 2f) . can anyone teach me how to derive it? 2. Relevant equations 3. The attempt at a solution sorry. i dont know how to use LATEX. it may be quite untidy if i type it using / sign for all the equation. so , i have did it beside the graph in the photo . hopefully you guys can understand .