z.khalid - glad to
bear with you!
If we have wind shear for example, does the indicated a/s change?
Think about it; a body in motion tends to remain in motion (at the same inertial speed) until acted upon by a force.
So if you are flying in zero wind at 150kt, and are subjected to a sudden tailwind of 25 kt, your inertial speed (GS) cannot instantly change - Newtonian physics won't allow it. Thus your IAS will quickly drop by 25kt - and it will take some precious seconds to recover to 150kt IAS.
And the new GS
after recovery will be 175kt! The extra energy must come from added power and/or trading altitude for airspeed.