14. Cars that are moving along horizontal roads are going to be stopped by plowing into identical barriers. All of the cars are the same size and shape, but they carry loads with different masses. All of the cars are going to be stopped by the same constant force by the barrier. Rank the distance that will be needed to stop the cars with the same 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!