If you want to match up with the way guns work (or used to under 4E), each +1 DC represents a doubling of kinetic energy. Kinetic energy is proportional to the square of the velocity.
Using the previously given figure of 75 MPH for a typical fastball, 1400^2 / 75^2 = 358. So this super-fastball has roughly 360 times the KE of a regular one. That works out to +8 to +9 DC. Since there is so much wiggle room here, I'd just call it 12d N. Sounds about right.
And it had better be one tough baseball to avoid being destroyed on impact. It would also heat up a lot from air friction. Never calculated the melting point of a baseball before....
"I'm willing to suspend my disbelief, not hang it by the neck until dead"
- Arthur Samuels
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