A force is applied to accelerate an object on a smooth icy surface. When the force stops, which of the following will be true? (Assume zero friction.)  a. The object’s acceleration becomes zero. b. The object’s speed becomes zero. c. The object’s acceleration continues to increase at a constant rate.  d. The object accelerates, but in the opposite direction.

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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!