Shouldn't the slopped distance be considered instead of the height?
(Sayonara Zetsubou Sensei: chapter 233)
It's a deceptive thing, that incline.
As a human doing the work (human definition), it's intuitively less work to use the slope.
But in measurable, calculable physics terms, the slope only changes the time over which the Work (Physics definition) is done.
In this scenario since acceleration is near zero, it doesn't matter.