1. The problem statement, all variables and given/known data A 51.0 skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 3.30 . What speed does he need at the bottom? 2. Relevant equations I have no idea where to start with this problem. Physics is sooo difficult for me! 3. The attempt at a solution The furthest I got was to figure that length of the quarter pipe would be 5.184 m because one quarter of the circumference, which I calculated to be 20.735 m, would be 5.184m. I'm not sure if this was necessary or not.