Suppose an object is accelerated by a force of 100 N. Suddenly a second force of 100 N in the opposite direction is exerted on the object, so that the forces cancel. The object(a) is brought to rest rapidly.(b) decelerates gradually to rest.(c) continues at the velocity it had before the second forcewas applied.(d) is brought to rest and then accelerates in the direction of the second force.

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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!