Let's imagine that humanity has invented an antigravity device. A practical question arises: What power is needed to use the antigravity device to keep an object with mass m at a constant height above the Earth's surface in a uniform gravitational field? In essence, the task boils down to determining the power required to annihilate gravity that compels an object with mass m to fall to the Earth.

Will this power be the same as for the uniform rectilinear motion of the object against the lines of force of the field?