Member Rara Avis
In a vacuum -- you would accelerate until you smacked into Terra-Firma.
Which is about as Terminal as it gets.
Point being, even without intervening friction, there is always a terminal velocity, i.e., a speed that will never be exceeded. That speed is determined by the equation v = sqrt(2GM/R) and is a function of M (mass of Earth) and R (radius). That works out to about 7 miles per second, which should sound familiar. The speed at which an object would fall at any given point on a falling trajectory is exactly equal to its Escape Velocity at that same point.
The gravity from a black hole is so strong that an object falling into it accelerates infinitely -- to the speed of light
Sorry, LR, but "accelerates infinitely" and "to the speed of light" aren't the same thing - as anyone who watches Star Trek would quickly explain.
Einstein contended that anything with mass could never travel AT the speed of light, because the math would result in division by zero, which he interpreted to mean an increase to infinite mass. Even if we accept that (and I don't, believing indeterminate mass is more correct), there is nothing in Relativity that precludes traveling faster than the speed of light. That's why science is still looking for the hypothetical tachyon.
BTW, LR, your contention that a black hole is both an irresistible force and an immovable object should be explorable without any reference to specific properties. As Ron already alluded, black holes are likely a dime a dozen in the dense nucleus of a galaxy, and are eating each other constantly.
Take any two irresistible forces in close proximity and the inevitable result will be a single irresistible force. Ergo, an irresistible force, by definition, must be unique.