Posted by tommy on Monday, September 6, 2010 at 7:59pm.
A quarterback is asked to throw a football to a receiver that is 32.1 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand?

physics  drwls, Monday, September 6, 2010 at 8:31pm
The minimum speed required for a given distance is achieved when the ball is thrown at a 45 degree angle. In that case,
X = Vo^2/g
For other launch angles, the horizontal distance covered is
(Vo^2/g) * sin 2A
where A is the launch angle, measured from horizontal.
Use the first equation to solve for the initial velocity Vo.