Homework Help: Physics

Posted by Sierra on Wednesday, June 20, 2012 at 11:18pm.

A quarterback is asked to throw a football to a receiver that is 32.6 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand? Ignore air resistance. Assume the ball is caught at the same height as it is thrown.

Physics - drwls, Thursday, June 21, 2012 at 5:14am
The formula you need to use for the distance R of the pass, which is easily derived, is

R = 32.6 = (Vo^2/g)*sin(2A)

Vo is the velocity at which the ball is thrown

For the minimum required speed, make A = 45 degrees, so that 2A = 90 degrees.

32.6 = Vo^2/g
Vo = 17.9 m/s
Physics - Elena, Thursday, June 21, 2012 at 5:16am
L=vₒ²•sin2α/g,
vₒ =sqrt(L•g/sin2α)
min vₒ at sin2α = 1
vₒ =sqrt(L•g) = sqrt(32.6•9.8) =17.87 m/s

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