1. The problem statement, all variables and given/known data Ok so there was a question on a physics quiz I did that I have no idea how to answer. There was a roller coaster going down a hill with an initial velocity of 1.67m/s. The hill is 60m long and had an angle of 40 degrees. There is a coefficient of friction of 0.100 with the roller coaster. We had to find the final velocity 2. Relevant equations Ff=uFn F=ma d=vot + 1/2at2 3. The attempt at a solution I honestly had no idea what to do for this question. I assume it had something to do with the x and y components of velocity, but I feel like you need mass or acceleration to answer this question and I don't know how to relate velocity to friction.