QB Throws Football: Speed, Angle, & Distance Needed to Catch

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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.
 
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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.
 
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.
 
R represents the horizontal distance covered by the projectile.