A man pushes a lawn mower on a level lawn with a force of 250N. If 40% of this force is directed downward, how much work is done in joules by the man in pushing the mower 6.2 m?

When considering work, we always take the force directed along the axis of motion (in this case, the horizontal axis). If 40% of the force is directed downward, then 60% of the force is being directed horizontally, so the horizontal force is 250*0.6 = 150N. Work = Force * distance = 150N * 6.2m = 930J