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Homework Help: How to find the missing displacement (vectors)?

  1. Jul 3, 2012 #1
    1. The problem statement, all variables and given/known data

    After three days of hiking, a group of hikers are 30km N from their starting position. On the first day, they hiked 20km E. On the second day, they hiked 30km 53 degrees N of W, calculate their displacement on the third day.
    2. Relevant equations

    I haven't a single clue

    3. The attempt at a solution
  2. jcsd
  3. Jul 3, 2012 #2
    Hi marbille9, welcome to PF.

    Start by drawing the vector diagram out...The final displacement is the vectorial sum of their displacements on each day.
  4. Jul 3, 2012 #3
    30km N is the resultant vector. But I don't kow how to find the displacement on the third day.
  5. Jul 3, 2012 #4
    Well, the displacements in the north-south direction don't effect the displacements in east-west direction. Sum the individual displacements in each direction (i.e NS, and WE) and equate the NS to 30, and the WE sum to 0....

    PS : You need to show some more work, so that you can be helped better :wink:
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