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Homework Help: 2 dimensional acceleration

  1. Sep 28, 2008 #1
    1. The problem statement, all variables and given/known data

    A watercraft with an initial velocity of 6.4 m/s [E] undergoes an average acceleration of 2.0 m/s^2 for 2.5 s. What is the final velocity of the watercraft

    3. The attempt at a solution

    i'm lost :(
  2. jcsd
  3. Sep 28, 2008 #2


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    Homework Helper

    Welcome to PF.

    What equations do you know that would relate velocities and acceleration and time?
  4. Sep 28, 2008 #3
    Vf = Vi + aav(t)

    and thank you for the welcome :)
  5. Jan 28, 2009 #4
    That equation doesn't work. It's 2 dimensional. South acceleration with an Eastern intial velocity. I've been on that question for way too long. Please help.
  6. Jan 28, 2009 #5


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    Homework Helper

    Starting from rest then what will the {S} component of velocity be after 2.5 s?

    The V = a*t cited would work just fine.

    Armed with the {S} velocity and knowing that the {E} velocity is unchanged, then simply add the velocities as vectors. Let Pythagoras be your guide.
  7. Jan 28, 2009 #6
    oh my... thanks a lot. i'll be able to sleep tonight now.
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