Suppose that a 1800 kg car passes over a bump in a roadway that follows the arc of a circle of radius 21.4 m as in the figure below.   (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 31.0 km/h? (Neglect friction.)   (b) What is the maximum speed the car can have without losing contact with the road as it passes this highest point?  km/h

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!