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Am i doing this problem right? help please

  1. Sep 16, 2008 #1
    am i doing this problem right? help please!!!

    1. The problem statement, all variables and given/known data

    a particle initially located at the origin has an acceleration of a=3 j m/s2 and an initial velocity of vi= 5 i m/s. find a.) the vector position and velocity of the particle at any time t and b.) the coordinates and speed of the particle at t=2 s.

    2. Relevant equations



    3. The attempt at a solution

    so for a.) i got the equation xf=0+5(t)+.5(3)(t2) im not really sure where to go from there. it says for any time, so do i just put in any number
    to get the velocity i did vf=5+3(t)

    for b.) do i just plug in 2 for the times above. im really not sure if im doing this right
     
  2. jcsd
  3. Sep 16, 2008 #2

    danago

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    Re: am i doing this problem right? help please!!!

    When it says at any time, i think its just saying come up with an equation that gives the displacement for any given value of t, so you would leave t as a variable.

    And yea then just plug t=2 into the equations :smile:

    EDIT: Besides what i missed about the vectors, and tony mentioned below :)
     
    Last edited: Sep 16, 2008
  4. Sep 16, 2008 #3

    tony873004

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    Re: am i doing this problem right? help please!!!

    Your answer should have [tex]{\rm{\hat i}}[/tex] and [tex]{\rm{\hat j}}[/tex] in them, or your answer is not in vector notation.
     
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