If a nonzero constant net external force acts on an object during a given period, which of the following statements must be true during that time? a. The object accelerates b. The magnitude of the object's velocity increases c. The acceleration of the object is increasing d. The object moves

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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!