Originally Posted by
Wizofoz
No, speed and velocity are completely different things and are useful; in different circumstances.- and if your whole argument has been that they are the same, you have been sadly mistaken.
Your one post up is just silly- turning your back does not change your velocity.
Do you think there's an error in the math? If so, what is it? First you weren't happy that there were negative groundspeeds, so now that they're all positive, then what?
Do you apply that same criticism to scenario A? If not, why not? What's the difference?
Scenario A (Cessna)
final groundspeed minus initial groundspeed
(airspeed + tailwind) - (airspeed - headwind)
(100+10)-(100-10)
110-90
20