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Motion and displacement

  1. Jan 10, 2010 #1
    While John is traveling along a straight inter-
    state highway, he notices that the mile marker
    reads 236 km. John travels until he reaches
    the 140 km marker and then retraces his path
    to the 173 km marker.
    What is John’s resultant displacement from
    the 236 km marker?
    Answer in units of km.

    I keep getting 63, but the computer says it's wrong
     
  2. jcsd
  3. Jan 10, 2010 #2
    Displacement is a vector, it has direction as well as magnitude.
     
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