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Homework Help: Projectile Motion

  1. Jan 3, 2010 #1
    1. The problem statement, all variables and given/known data

    - ball is thrown with a horizontal velocity of 18 m/s directly toward a tree
    - person who threw the ball is 1.5 m above the ground and 9 m away from the tree

    looking for time it takes to hit the tree, what height the ball hits the tree at, and the balls velocity when it does so.

    2. Relevant equations

    Well, we know the velocity of x which is 18 m/s, the initial y velocity which is zero, the distance between the ball and the tree which is 9m and the initial height of the ball which 1.5m.

    To find time there are many formulas but they all have (delta)d of y, but u dont have d2 so i cant find it using any of those. After getting time i can the formulas to find the others.

    3. The attempt at a solution

    No idea. No formulas that have what i need.

    Do i need to first find the y final velocity using a different formula??
    Last edited: Jan 3, 2010
  2. jcsd
  3. Jan 3, 2010 #2
    i would just use v=x/t to solve for time because there is no acceleration.
  4. Jan 3, 2010 #3

    I forgot that vx stays constant.
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