I think Book Worm has Newton I & Newton II a little confused. He mentions the momentum, but the aircraft with 60KIAS in the 60kt headwind has ZERO momentum, it only has inertia.
That is entirely the point, Avi8tor. Newton's laws concern velocity, which is a vector quantity. A 180 degree turn requires the same change in momentum, regardless of the steady wind (and in fact, regardless of the frame of reference).
Newton's laws govern changes in velocity and momentum, not changes in speed.