A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
A. 7.0 kN up
B. 7.0 kN down
C. 2.8 kN down
D. 2.8 kN up
E. 5.6 kN down
Answer: D
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