Question

a small plane is traveling due south a t a velocity of 90 m/s. It suddenly encounters a tailwind of 27 m/s heading due south. what is The "air velocity" of the plan stays the same....but what is the resultant velocity (aka..."ground velocity") of the aircraft?

Answer 1

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Answer 2

The air velocity is indeed still +90 m/s (due south).
The velocity with reference to ground is
Vg=+90+(-27)=63 m/s (due south).

Think of the plane moving south for 90 m in one second, and head wind blows it back towards north by 27 m, also in one second, so the net/ground velocity is therefore 90-27=63 m/s.