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2. A roller coaster car travels around a vertical loop. At the top of the loop, where it is upside down, it is moving at a speed of 10 m/s. Given that the loop has a radius of 8.0m, a) What is the value of the car's centripetal acceleration at that instant in time? b) A 55 kg passenger is in the car. Draw a free-body diagram showing all the forces acting on the passenger. c) What is the magnitude of the normal force of the car acting on the passenger