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Projectile motion solving

  1. Sep 26, 2014 #1
    Hi, I am having problems solving the last problem(see attached files), i have derived these equations which i thought should would help me solve the problem but i seem to be stuck.

    U=(H3-H4)/(d4-D4)

    Height at t

    h and H3 are the same so i set H(initial)=0

    -0,5gt^2+vsin(θ)t=-u*3*cos(θ)vt

    Slope at t

    -gt+vsin(θ)=uvcos(θ)

    All help is appriciated

    Anders.
     

    Attached Files:

  2. jcsd
  3. Sep 26, 2014 #2

    haruspex

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    How do you get that equation? Why does it matter what the speed is after clicking (other than that it has enough impetus to break the window)?
     
  4. Sep 26, 2014 #3

    Ray Vickson

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    Please do not post thumbnails; I could not read your solution on some media!

    On the computer I am using now it is readable, but it is so simple you should have just typed it our directly. Read the 'pinned' thread 'Giudelines for students and helpers" by Vela, which discusses why thumbnails should be avoided if possible. (They are OK for things like diagrams from books and papers, etc., but should not be used for things like problem statements and/or written solutions.)
     
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