Physics

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A roller-coaster car speeds down a hill past point A where R1 = 9.8 m and then rolls up a hill past point B where R2 = 15.8 m (R1 and R2 represent the radiuses/ radii)

The car has a speed of 18.6 m/s at point A. if the track exerts a normal force on the car of 2.16 104 N at this point, what is the mass of the car? (in kg)

What is the maximum speed the car can have at point B for the gravitational force to hold it on the track? (m/s)

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