Just a simple question. Does landing at 5,000ft above sea level require a faster speed than landing at 100ft above sea level? Thanks in advance.
The answers above are the real McCoy, and very accurate.
But I wonder if you wanted a simple answer to a simple quesiton, so at the risk of over-simplification, here's one. At 5000 ft the aircraft speed over the ground at touchdown will be faster than at sea-level because the air is thinner.
I have to add, though; "other things being equal apart from air temperature and pressure which will be lower at 5000 ft".
(Other things include....weight, wind, pilot's inclination to fly by the book, etc)