[petschge]

IF the velocity would change from 0.7m/s to 0m/s over one second, the acceleration would be 0.7m/s/s. But if the time span over which that velocity change is (much) shorter, the acceleration would be (much) higher.

[adgjlsfhk1]

Is it much shorter? An airplane does take a while to settle down. You land tail first and the nose generally takes a second or so to come down.

[bdamm]

Not typically. An airliner can and often does stall just above the runway and then falls the very small distance that remains. So the formula would be more like the airplane falling from a few feet up. The tail is still generating downforce (the opposite of lift) which is why the nose is in the air.