Two objects one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because: OA) anything falling in vacuum has constant velocity OB) all objects reach the same terminal velocity OC) the acceleration of the larger object is three times greater than that of the smaller object OD) the force of gravity is the same for both objects El none of the above

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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!