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Kinematics in 2 dimension

  1. Sep 22, 2008 #1
    1. The problem statement, all variables and given/known data

    Useful background for this problem can be found in Multiple-Concept Example 2. On a spacecraft two engines fire for a time of 871 s. One gives the craft an acceleration in the x direction of ax = 6.00 m/s2, while the other produces an acceleration in the y direction of ay = 5.68 m/s2. At the end of the firing period, the craft has velocity components of vx = 5800 m/s and vy = 6420 m/s. Find (a) the magnitude and (b) the direction of the initial velocity. Express the direction as an angle with respect to the +x axis.

    2. Relevant equations
    most likely the use of the 4 main kinematics equations


    3. The attempt at a solution

    basically i have no idea where to begin in this question, its computer question and I keep getting the incorrect answer, if anybody has suggestions how to begin this problem that would be nice, like what wud i do with that time of 871 s?
  2. jcsd
  3. Sep 23, 2008 #2


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    Science Advisor
    Homework Helper

    Hi zn23! :smile:

    You can forget equations involving x … there's no distance involved in this problem. :wink:

    Hint: Find ∆Vx and ∆Vy, and then its' a simple vector addition problem . :smile:
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