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Projectile Motion without Initial Velocity

  1. Aug 20, 2013 #1
    Projectile Motion without Initial Velocity (Only time and angle given)

    1. The problem statement, all variables and given/known data

    A projectile is launched at an angle of 50° above the horizontal and it hits the ground in 12 seconds.

    a. Calculate the maximum height of the projectile.
    b. Find the range of the projectile.

    2. Relevant equations

    [itex]H_{max}=\frac{V_{o}^{2}+sin^{2}\theta}{g}[/itex]

    [itex]R=V_{o}\sqrt{\frac{2H}{g}}[/itex]

    3. The attempt at a solution

    I don't know where to start. I can't solve without Vo and I am missing Vo.
     
    Last edited: Aug 20, 2013
  2. jcsd
  3. Aug 20, 2013 #2

    lewando

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    Can you not use a standard kinematic equation to get vy0?
     
  4. Aug 20, 2013 #3
    I need [STRIKE]Vo to find height and range, not Vyo[/STRIKE]

    EDIT: I found a formula to help me solve it all! :approve:

    [itex]V_{y}=V_{o}Sin(\theta)-gt[/itex]

    [itex]V_{y}=0[/itex]
     
  5. Aug 20, 2013 #4

    lewando

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    But if you can find vy0, then you can find v0 with some simple trig.
     
  6. Aug 20, 2013 #5

    lewando

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    That will work. At what t will vy = 0?
     
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