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A quaterback throws a football towards a reciever with an initial speed of 22m/s,

  1. Sep 14, 2007 #1
    a quaterback throws a football towards a reciever with an initial speed of 22m/s, at an angle of 34 degrees above the horizontal. At that instant, the reciever is 21 m from the quarterback. The acceleration of gravity is 9.8 m/s ^2. WIth what constant speed should the reciever run in order to catch the football at the level at which it was thrown? Answer in units of m/s.
     
  2. jcsd
  3. Sep 14, 2007 #2
    What are the important equations for projectile motion? There should be two you should be using, one for the horizontal direction and one for the vertical.
     
  4. Sep 14, 2007 #3
    Applying the equations determine range R and time of flight T of the football. To catch the football, the reciever must cover a distance (21 - R) m in time equal to time of flight T. Speed of reciever = (21-R)/T.
     
  5. Sep 15, 2007 #4
    what does the variable R represent?
     
  6. Sep 15, 2007 #5
    R represents the horizontal distance covered by the projectile.
     
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