1. The problem statement, all variables and given/known data A 1000kg car travels around a frictionless banked curve having a radius of 80m. If the banking is 20 degrees to the horizontal, at which specific speed must the car travel to maintain a constant radius? 2. Relevant equations Fc = mv^2/r Fg(perp.) = mgcos(20) 3. The attempt at a solution Would someone explain to me why we use the perp instead of the parallel angle on the incline? Is it because the car is travelling in the straight (toward the plane) direction along the banked curve?