Yes, Hamid you are correct F=1/2 M(V squared).  A friend of mine took a turkey buzzard literally in the face after it came through the windscreen of an A-6 Intruder at 420 KTAS. He did survive. Don't think that a little bird won't do a lot of damage to these machines. Bird strikes cost the aerospace industry millions each year and there are occasional deaths and injuries to non feathered fliers. If you see a bird approaching get your head below the dash for maximum protection should one penetrate the windscreen . If one does hit the aircraft and you suspect any damage do a controllability check at altitude (probably above 5000' AGL) to determine flying qualities at approach landing speeds and configuration before you commit to a lower altitude. Fly an approach  speed at least 30% or 10 KIAS  above your lowest controllable speed and fly the aircraft onto the runway. Jeff Edwards math deficient