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Projectile Motion apple thrown

  1. Oct 21, 2012 #1
    1. The problem statement, all variables and given/known data
    A child sitting in a tree throws an apple core from where he is perched (4 m high) with a velocity of 5 m/s [35 degrees above horizontal] and it hits the ground next to his friend.
    How long before the core hits the ground?


    2. Relevant equations
    dy = vy(initial)t + 1/2at
    quadratic eqn.

    3. The attempt at a solution
    Would I calculate the x-y components of the initial velocity then plug in the initial y velocity to the first aforementioned eqn then solve for t using the latter eqn?
     
  2. jcsd
  3. Oct 21, 2012 #2
    Don't mind that comment! read it too fast, I did not take angle into account, I thought he was throwing it straight down. Whoops! that's embarrassing, back to high school physics for me
     
    Last edited: Oct 21, 2012
  4. Oct 21, 2012 #3
    Your first equation is wrong. You're forgetting the dy(initial) term.
    Other than that, you're right.
     
  5. Oct 21, 2012 #4
    Do not do what FaynmanIsCool wrote. The final velocity is not 0, he didn't account for the launch angle, and he has the wrong sign for a.
     
  6. Oct 21, 2012 #5
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