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Homework Help: Positon Vector

  1. Apr 23, 2012 #1
    1. The problem statement, all variables and given/known data

    find the position (r) when the vector comes to rest.

    2. Relevant equations

    initially velocity = 'u', acceleration = a
    u= -14i-7j
    a= 6i+3j

    3. The attempt at a solution

    hey guys im new at this so i didnt know how to post it but some help would be great :)
    i tried solving it for when v=0 but i didnt know how, neither could i differentiate it :/
  2. jcsd
  3. Apr 23, 2012 #2
  4. Apr 23, 2012 #3


    User Avatar

    Staff: Mentor

    Hi thunderflap, Welcome to Physics Forums.

    Were you given an initial position vector too?

    What are the (calculus) relationships between position, velocity, and acceleration? If this had been a problem not using vectors and you were given separate x and y components for acceleration and initial velocity, what would your approach be? What kinematic formulas might you employ?
    Last edited: Apr 23, 2012
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