wo forces act on an object.  The magnitude of the net force acting on the object a) Equals the sum of the magnitudes of the two forces b) Equals the difference in the magnitudes of the two forces c) Equals the average of the two forces d) Cannot be determined from the given information

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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!