Three astronauts leave Cape Canaveral, fly to Mars and back, and then splash down in the Pacific Ocean.  An Admiral bids them goodbye at the Cape and then sails to the Pacific Ocean in an aircraft carrier where he picks them up.  Who has the greater displacement, the admiral, or the astronauts?

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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!