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Motion in Two or Three Dimension : Projectile motion

  1. Feb 26, 2014 #1
    1. The problem statement, all variables and given/known data

    A projectile is launched at a 60° angle above the horizontal on level ground. The change in its velocity between launch and just before landing is found to be Δv = vlanding _ vlaunch = -20 y^ m/s .
    What is the initial velocity of the Projectile ?
    What is its final velocity just before landing ?
    2. Relevant equations

    Δv = vlanding _ vlaunch = -20 y^
    m/s .
    3.The attempt at a solution
    I considered :
    Vox - Vfx = 0 and Voy - Vfy = -20
    knowing that V²fy - V²oy= -2g (Yf-Yo) But I couldn't go further
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Feb 26, 2014
  2. jcsd
  3. Feb 26, 2014 #2

    haruspex

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    "+"?
    What is the value of Yf-Yo?
     
  4. Feb 26, 2014 #3
    Yes , just saw it ! I edited the post !
    I have no idea about Yf-Yo ,I couldn't guess it from the problem statement !
     
  5. Feb 26, 2014 #4

    haruspex

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    It is launched from, and lands on, the same level ground.
     
  6. Feb 27, 2014 #5
    so V landing = 0 ?? Because we know that v = sqrt(Vo²-2g(Y-Yo))
     
  7. Feb 27, 2014 #6

    PhanthomJay

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    No, you should check your algebra on that equation. But regardless, there are serious flaws in the problem statement. Did you word it correctly?
     
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