The question is "A roller coaster at a popular amusement park has a portion of the track that is similar to the diagram provided. Assuming that the roller coaster is friction less, find its velocity at the top of the loop. 1. The problem statement, all variables and given/known data Vi = 0 m/s Vf = ? Distance from bottom to the very top is 70m Distance from bottom to the loop is 30m 2. Relevant equations Ek = 1/2m x v^2? Eg = m x g x Delta h? 3. The attempt at a solution What do I have to find first in order to find the velocity?