Short Answer
In the figure,a stunt car driver negotiates the frictionless track shown in such a way that the car is barely in contact with the track at the top of the loop.The radius of the track is 9.9 m and the mass of the car is 1800 kg.Find the magnitude of the force of the car on the track when the car is at point A.You can treat the car as a point mass. 
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