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Net Displacement

  1. Dec 17, 2006 #1
    1. The problem statement, all variables and given/known data

    A jogger runs 10.0 blocks due east, 5.0 blocks due south, and another 2.0 blocks due east. Assume all blocks are of equal size. Use the graphical method to find the magnitude of the jogger's net displacement?


    2. Relevant equations

    well a sketch, but I've tried it and I don't really get it.


    3. The attempt at a solution

    so I kind of think what I'm doing but not really... ok the jogger started at 10 E. and then he went 5 N. and then went to 2 E, do you subtract the 10 and the 2, both that are east? and then add the 5... ugh, I don't know how to work this out. I know that its how much it went from where he started from, but not really sure how to find the answer. The answer is 13 blocks, but how do I get to that? Thanks.
     
  2. jcsd
  3. Dec 17, 2006 #2
    how far does he go east in total and how far south?
     
  4. Dec 17, 2006 #3
    12 east and 5 south
     
  5. Dec 17, 2006 #4
    okay, if you draw that, and then draw a straight line from the start to finish, do you see any way to figure out how long the line is?
     
  6. Dec 17, 2006 #5
    oh my gosh, got it! thanks! pythagorean theorem, right?
     
  7. Dec 17, 2006 #6
    yeah, good job!
     
  8. Dec 17, 2006 #7
    thanks. =)
     
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