figure below shows a roller-coaster car on a track. The car is fully loaded with passengers and has a total mass of 485 kg. At point A, the car is at the lowest point in a circular arc of radius r1 = 12.0 m. At point B, the car is at the highest point of a circular arc of radius r2 = 16.8 m. What is the maximum speed (in m/s) the car can have at point B in order for the car to maintain contact with the track at all times (that is, so that it does not "jump" off the track)?

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