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Homework Help: Vector components problem determinings final kinetic energy

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data

    question 2

    http://web.viu.ca/hearnd/Courses/Phys121/F02Test2/Page%201.htm" [Broken]
    3. The attempt at a solution

    I have been trying to do question 2 on the practice test but I am stuck.
    I was trying to calculate the final velocities along each vector by using the equation
    first i determined the acceleration by dividing each of the force vectors by the mass of the object
    but since one of the accelerations was negative I could not calculate the final velocity of that vector

    so now I am trying with the total vectors for

    sqrt(4^2 +0 +0)

    because only one component out of three has any initial velocity

    so vi=4m/s

    a= 2.69258 m/s

    d=sqrt(16^2+4^2+8^2)= 18.3303



    which is wrong

    any help would be appreciated
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 21, 2009 #2


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    Homework Helper

    Work done = F.r = Change in KE.
  4. Nov 21, 2009 #3
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