A 5kg box rests on a flat, level floor. There is friction between this box and the floor with  μs=0.40 and  μk=0.30. The box is pushed horizontally with the minimum force required to get it moving and continues to be pushed with this force afterwards. How far has the box moved after 8s. You can assume g=10 m/s2

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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!