1. The problem statement, all variables and given/known data The radius of curvature of a loop-to-loop roller coaster is 12 m. At the top of the loop, the force the force that the seat exerts on a passenger of mass m is 0.4 mg. Find the speed of the roller coaster at the top of the loop. 2. Relevant equations ƩF = Fnet = ma ac = v2/r Fg = mg 3. The attempt at a solution ??