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Determine the displacement of the object

  1. Aug 30, 2015 #1
  2. jcsd
  3. Aug 30, 2015 #2

    haruspex

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    What exactly does the question ask you to do?
     
  4. Aug 30, 2015 #3
    It asks me to find the displacement of an object on the graph from 0 s to 80 s. I would subtract initial position (0 m) from final position (5 m) and got my attempted answers. However, they were incorrect. How would you do? Thank you!
     
  5. Aug 30, 2015 #4

    haruspex

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    Your answer looks right to me. It might be worth posting the exact wording, just in case.
     
  6. Aug 31, 2015 #5
    Determine the displacement of the object.
    Express your answer in terms of unit vector i^. To denote unit vectors in your answer, be sure to select the 'unit vector' button.
    = ------- m

    Similar picture of the tool: http://help.pearsoncmg.com/masterin...magesStudent/numeric_units_provided_html5.png

    So I copy and paste word by word of the question but I wonder if my answers were wrong because it had to something with 'unit vector' button or signs. I clearly see the form of filling in the blank already has a unit of meter (m). Since it is a computational homework, I really don't know what it wanted me to do.
     
  7. Aug 31, 2015 #6

    haruspex

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    In the blue menu bar at the top of the screenshot, the two leftmost items have white symbols on a grey background. I would guess that clicking (or hovering over?) these produces a pull-down menu. In particular, the leftmost looks like it might hold a collection of useful mathematical symbols, such as a unit vector. If not, try the other one, which appears to be for Greek characters etc.
     
  8. Aug 31, 2015 #7
    I see the unit vector button now and so the answer is +5 i^, right?
     
  9. Sep 1, 2015 #8

    haruspex

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    Yes.
     
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