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Homework Help: A missile fired

  1. Dec 7, 2008 #1
    1. The problem statement, all variables and given/known data
    A missile is fired with an initial velocity of 85 m/s at an angle of 30 degrees from the horizontal.

    A) After how many seconds will the missile reach the highest point?
    B) What is the maximum height reached by the missile?
    C) Calculate the total horizontal distance traveled by the missile until it hits the ground.

    2. Relevant equations

    teta = arc tangent Voy/Vox

    Vfx = Vocoy teta t

    tf = -2 Voy sin teta / g

    3. The attempt at a solution

    A) tf = -2 Voy sin teta / g
    = -2 (85m/s) (sin 30) / 9.81m/s^2
    = -85m/s / 9.81m/s^2
    = -8.66 s

    B and C i dont know which formula to use
  2. jcsd
  3. Dec 7, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Apply the following formula to the vertical motion:
    [tex]v = v_0 + a t[/tex]
    Some useful kinematic formulas are summarized here: https://www.physicsforums.com/showpost.php?p=905663&postcount=2"
    Last edited by a moderator: Apr 24, 2017
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