1. The problem statement, all variables and given/known data I have a roller coaster with 6 segments. i must find the speed, potential energy, and kinetic energy at the beggining and end of each segment that a marble rolls through. Lets say that the marble is 8.47kg in mass, and i have one segment of the coaster having a distance of 0.39m. How do i calculate the velocity, and kinetic energy with those two pieces of information only? Also, do i need to hae the angle of incline to answer these questions? 2. Relevant equations Ek=1/2mv^2 Ep= mgD v=(root)[2Ek/m) w= Fapp x D 3. The attempt at a solution i tried finding potential energy, and the work. but didnt know what to do after that.