A book is resting on a table and not moving.  Which statement is true about the forces acting on the book? a.) The book experiences more than one force, but the net force is zero. b.)The book experiences more than one force, and the net force is not zero and downward. c.)There are no forces acting on the book. d.) The book experiences only one force, the downward pull of gravity.

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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!