When the rocker engines on the starship enterprise XIII are suddenly turned off while travelling in empty space with no planets or stars near the starship will -slowly slow down and then stop -go faster and faster -move with constant speed -stop immediately

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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!