(this is for a hobby, not homework) I fully understand the drag equation and can work it forwards and backwards. http://en.wikipedia.org/wiki/Drag_equation How can I use the same data (plus mass if needed) to determine time to top speed or a given speed? I'm sure there is a simple formula related to the Drag Equation that gives time to speed. I am looking everywhere and I can't find what I need. Thanks a billion in advance for a shove in the right direction!