Would totally depend on the missile and where it is coming from. Anything behind ... acceleration wouldn't matter as few missiles would have been fast enough to close the gap. Missiles to the side would be outrun. Missiles from the front are another story. A missile rising up from a point in front of the aircraft is a deadly threat. It doesn't even have to match velocity to make a kill. In short: acceleration for missiles below and to the sides. Stuff in front, time to turn. Stuff behind, forget about it.