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Help please, simple problem

  1. Oct 22, 2007 #1
    1. The problem statement, all variables and given/known data

    A quarterback threw a football at 21 m/s at a certain angle above the horizontal. If it took the ball 2.7 s to reach the top of its path, how long was it in the air?


    2. Relevant equations
    i am confused, although you guys may find this to be simple. wat equations do i use?


    3. The attempt at a solution
     
  2. jcsd
  3. Oct 22, 2007 #2
    You have the initial spped it was thrown at. Let it be thrown at some unknown angle thetha. The resolve the speed into the vertical component. By putting final velocity equal to zero, you can find theta, because you are given the time it takes. Then you can calculate how long it is in the air for.
     
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