Displacement in Terms of Frame of Reference
A passenger moves from his seat to the back of the plane. His location relative to the airplane is given by x. The -4.0m displacement of the passenger relative to the plane is represented by an arrow toward the rear of the plane. Notice that the arrow representing his displacement is twice as long as the arrow representing the displacement of the professor (he moves twice as far).
Source
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"OpenStax College, College Physics. October 25, 2012."
http://cnx.org/content/m42033/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.