Hi again, its me.... Unfortunately you are overlooking the fact that the ASI only measures
forward velocity (pitot tubes only face forwards.)
So the statement by Worrab...
... though if you touch down at 45 knots into a 45 knot headwind you will have zero kinetic energy 
Is not absolutely true...
To land, you also need a
downward velocity, so many ft/sec, so you can still have considerable downward Kinetic energy, which can compress your suspension and bounce you back into the air... (been there, done that..)
Also the pitot tube will not pick up any
sideways velocity, which you will have when you bank in a very strong headwind.
A Velocity Vector is what is displayed on an ATC Radar screen, and shows the direction and speed that the aircraft is moving... It gives them some indication of the position you will be in in the next few minutes.
.