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8. A cart of mass 2.7 x 102 kg is travelling over the top hill of a roller-coaster track, where the curvature of the hill is 15 m. n = 2.7 x 102 kg r = 15 m a) If the cart's speed at this point is 8.2 m/s, determine the normal force of the track acting on the cart. a) 3 marks b) What is the maximum speed at which the cart can travel over this hill without rising off the track