A roller coaster car of mass 320 kg (including passengers) travels around a horizontal curve of radius

Question:

A roller coaster car of mass 320 kg (including passengers) travels around a horizontal curve of radius 35 m. Its speed is 16 m/s. 

(a) What are the magnitude and direction of the total force exerted on the car by the track? 

(b) What is the banking angle of the track if the frictional force is zero, so that the track exerts only a normal force on the car?

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