Please help me calculate minimum speed in this question

Hi. You asked for help calculating a minimum speed in the question. I do not understand the question because I do not see a question in your posted image. Please clarify.

Also, what is meant by stating that the human eye can only track 3 radians or less? 3 radians is 360 degrees; I would think one's eye would either be looking at the back of its socket, or their neck would snap!

Please provide the units for the speed measurement (can't possibly be 130 mph).

Curious that a baseball player "will always miss" by keeping their eye on the ball; I thought that's what they were trained to do. :?

I await a clearer exercise statement. Cheers
 
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