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My first week in hs physics and my teacher hasn't taught a thing

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data
    A boy throws a ball upward at 2.om/s out a window 2.5m above the sidewalk. The ball accelerates at 9.81m/s^2. How fast is it moving when it hits the sidewalk?


    2. Relevant equations
    i tried to use the equation: d= initial velocityxtime + .5(acceleration) (Time^2)


    3. The attempt at a solution
    2.5= 0 + .5(9.81)t^2
    2.5=4.9m/s^2 x t^2
    2.5/4.9= t^2
    ?????????????????
     
  2. jcsd
  3. Sep 19, 2009 #2
    Hey there natabong :smile: Can you list for me the other important kinematic equations (or the 'DVAT' Eqs) as they will be of use here.
     
  4. Sep 22, 2009 #3
    I have no idea what that means. what are kinematic equations?
     
  5. Sep 22, 2009 #4
    Try googling them or better yet, look in
    your text :smile:

    It doesn't matter how bad your teacher is;
    you will have the biggest impact
    on your grade. :wink:
     
  6. Sep 24, 2009 #5
    yeah, you're definitely right. Actually, i think he was just trying to scare us. It's getting a LOT easier.. right now we're doing vectors and scalars and its a breeze. There's also this study book that i got called "High marks" it's really awesome. It breaks down everything. He told us that the above problem was too hard for high school lol.
     
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