few general formulas

[kajunbee]

https://socratic.org/questions/if-an-object-is-moving-at-a-constant-velocity-is-there-no-work-done-on-that-obje

[lancaIV]

From work-definition,pos. or neg.,to force-definition with orientation-pos. or orientation-neg.to 'conservation of momentum' !
Lifting force = Hub-Kraft /traction force = Zug-Kraft !

From force to pressure to impulse !
Discussion is a fine 'thing' ,but a machine does not discuss,it works like constructed : right or wrong!

Sincere

OCWL
p.s.: nix85,from earth/ground fixed 3d building print system the evolution state is now in the flying 3d print drone, there you need real and right XYZ- coordination from the flying object and the work object !

Imagine : a flying platform( ' flying carpet') as rescue device in a storm ,from different directions the wind forces,                  but the platform has to stay ,relatively,still and in horizontal position !

lifting platform (~ vtol)  inventor idea : Erich Mehnert : DE19944785

[nix85]

p.s.: nix85,from earth/ground fixed 3d building print system the evolution state is now in the flying 3d print drone, there you need real and right XYZ- coordination from the flying object and the work object !

Imagine : a flying platform( ' flying carpet') as rescue device in a storm ,from different directions the wind forces,                  but the platform has to stay ,relatively,still and in horizontal position !

lifting platform (~ vtol)  inventor idea : Erich Mehnert : DE19944785

horizontal acceleration is doing work

[lancaIV]

what wesley also by his link delivered :


https://www.khanacademy.org/test-prep/mcat/physical-processes/work-and-energy-mcat/a/work-can-be-negative


Work can only be done on an object if it moves, if the object moves up 2 meters and then it falls back down 2 meters and returns to it's original position then there was no work done on the block. If the distance from the starting position and the ending position does not change then there was no work done on the block. So to answer your question, no gravity has done no work on this object because it just fell back to it's original position.

[nix85]

that is equivalent of pushing a book across a table and then
pushing it back to exactly same place
as far as book's position is concerned overall work is 0
but work has been done, ur energy has been wasted,
that is, converted