Virginia Earthquake!

#21
It will also slow it down, reducing the force of the impact a bit. But, if your shooting a simple ground to air missile at a moment when the meteor already hit earths atmosphere, youre to late anyway.
Still wouldnt matter. If we are planning on shooting nuclear missiles at an asteroid we better do it when its far away and hit it at a precise angle. At best we can use the impact of the missile to change the course of the space rock instead of breaking it into pieces.