I think it should be: "He threw/throws a ball 50 meters." By the way, the title should be 'usage', not 'useage'.
I found some similar sentences here http://books.google.com.vn/books?id=...20yard&f=false
The highlights being played showed Sonny scrambling around, like a magician, and throwing the ball sixty yards down field to his receivers for touchdowns.
Quinton hurls the ball almost seventy five feet in the air with a tight spiral, and the ball drops about ten yards ahead of Tyrone.
Hence, I think it's correct to say: "He threw/throws a ball 50 meters."
I just wonder if it's OK to say: "He threw/throws a ball for 50 meters."