Which of the following scenarios describes an object being acted on by a conservative force?

Question

 A woman hikes up a mountain to a point 20 feet above ground. A dishwasher was pulled up to a window by a rope, using a pulley system. A feather falls from one end of a tube to the other inside a vacuum. A puck glides across and slowly comes to a stop on an ice rink.

Answer 1

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I do believe that the one you want is the one which has no frictional losses

and

that's the feather falling in a vacuum

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