Speed question
Can anyone help me (non pilot, sorry) explain why the plane's (ground)speed didn't increase even though it was descending with almost 4000 fpm?
If you are flying level you fly 4 miles to cover 4 miles of ground. In climb or descent you have to fly more than 4 miles to cover 4 miles of ground.
So if you ground speed is the same (ignoring wind) you have higher airspeed in the climb or descent to maintain the same ground speed