Hi, I'm calculating the velocity of something that's stretching, and as it gets longer, the velocity decreases. So to calculate the velocity at time (t): v(t) = A / (B L(t)) A change in the distance over a small time dt will be given by: dL=v(t) dt So I guess the distance is: L= integral from 0 to t of v(t) dt ? How can I go about solving such an equation? Are itterative methods required? Can anyone give me some keywords to help my search on google? I don't really know where to start. Thanks a lot for your time.