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Projectile motion questiondon't understand about angles and vectors

  1. Aug 16, 2011 #1
    1. The problem statement, all variables and given/known data
    Giancoli 5th edition chapter 3 problem 38

    a rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235m below
    the plane is traveling horizontally with a speed of 69.4m/s
    b) supposes, instead that the plane releases the supplies a horizontal distance of 425m in advance of the moutain climbers. What vertical velocity should the supplies be given so that they arrive precisely at the climbers position?




    3. The attempt at a solution

    I attempted it several times using two different method
    the second time was using

    [tex] X = V_0 t [/tex]
    t= 6.12s

    so then
    [tex] y =y_0 + V_0t + 1/2 a_y (t^2) [/tex]

    answer was 8.41m/s


    but then my question is that
    for my first attempt at this question
    I try to figure out the angle if they threw it upward or downward
    but why does that angle not matter for the vertical or horizontal velocity?
     
  2. jcsd
  3. Aug 16, 2011 #2
    O DUDE
    I reread the question and it said it only gave vertical velocity
    thats why
    okay no need for help now
    thx
     
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