It is past midnight and Sue is sliding down a rope from her third floor window to meet her boyfriend. As she slides down the rope faster and faster she becomes alarmed and gradually tightens her grip on the rope. Thus the tension in the rope gradually increases. When the tension becomes equal to Sue's weight (ignore the mass of the rope), A. (a) Sue will stop. B. (b) Sue will slow down. C. (c) Sue will continue downward at constant speed. D. (d) the rope will break.

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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!