1. The problem statement, all variables and given/known data A 1200 kg car travels around a curve banked at 42.5 degrees in a circular path of radius = 150m, but the ramp is only 55m long. The force of friction on the car is 9000N, calculate the speed of the car. So: radius = 150 m θ (angle the incline makes with the horizontal) = 42.5 mass = 1200 kg Friction = 9000 N 2. Relevant equations Fc= FNx + FFx Fc= mv2 / r 3. The attempt at a solution The car does not move in the y-plane, therefore: Ff + Fg + FN = 0 FN = (mg + Ffsinθ)/cosθ Solve for FN and I got 24213.83512 N Then I used the value of FN to find FNx and added FFx to it. Then I multiplied by the radius, divided by the mass and took the square root leaving me with 54m/s. However, when I use the formula found on this page http://en.wikipedia.org/wiki/Banked_turn" [Broken] I got 67 m/s. Which one is right? And If I'm wrong, where did I go wrong?