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Homework Help: 2D projectile motion (on calculator?)

  1. Nov 9, 2009 #1
    1. The problem statement, all variables and given/known data

    A person is standing on a cliff that is 10m tall, the boy is 2m back from the ledge of the cliff.
    He shoots an arrow at a 45 degree angle. Initial velocity is 5 m/s.

    I need to find max height when the arrow will reach the height. How far the arrow went in the X direction, and How far should I build a wall that's .5m high, so that the arrow just misses the wall.

    **We can use our calculators.

    2. Relevant equations
    To set this up I used y1= -9.8 y2=-9.8t y3=10+3.5t-4.9x^2 y5=3.5 y6=-2+3.5t
    I found 3.5 from the Sin and Cos of 45.

    3. The attempt at a solution

    I found the max height and the time that the arrow reached it from the parabola on my calculator 10.6m at .36sec
    but I can't seem to find the other ones. I just need to know which line to look at.

    Thanks so much!
  2. jcsd
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