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Homework Help: Vector kinematics question

  1. Sep 11, 2010 #1
    1. The problem statement, all variables and given/known data
    Exactly 3.3s after a projectile is fired into the air from the ground, it is observed to have a velocity v = (8.6i + 5.0j ), where the x axis is horizontal and the y axis is positive upward.

    Determine the horizontal range of the projectile

    2. Relevant equations
    x=x0+vy0t+1/2at2
    v=[tex]\sqrt{}Vx[/tex]2+Vy2

    3. The attempt at a solution
    v= 9.95 by finding the resultant of the velocity vector
    x 0 = 0
    ax= 0
    x= Vx(t)?
    is that correct?
    if so then,
    x= 9.95(3.3)= 32.8?
    but this is wrong and i don't know how to get it
    wait does R= x? or y?
     
    Last edited: Sep 11, 2010
  2. jcsd
  3. Sep 12, 2010 #2

    kuruman

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    Science Advisor
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    Gold Member

    Use the information that v = (8.6i+5.0j)m/s in 3.3 s to find the components of the initial velocity vector. Then use the equation that relates the range R to these initial components to answer the question.
     
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