1. The problem statement, all variables and given/known data A special electronic sensor is embedded in the seat of a car that takes riders around a circular loop-the-loop at an amusement park. The sensor measures the magnitude of the normal force that the seat exerts on a rider. The loop-the-loop ride is in the vertical plane and its radius is 18 m. Sitting on the seat before the ride starts, a rider is level and stationary, and the electronic sensor reads 950 N. At the top of the loop, the rider is upside-down and moving, and the sensor reads 300 N. What is the speed of the rider at the top of the loop? 2. Relevant equations a=v^2/r 3. The attempt at a solution 950/9.8=96 kg 300=790-96(v^2/18) ???