when an object is raised vertically, work is done against __________. what one word completes the sentence?

The one word that completes the sentence "When an object is raised vertically, work is done against ________." is "gravity." More precisely, the work done when raising an object vertically is against the gravitational force. This means the force that pulls objects downward due to Earth's gravity is what the work is done against to lift the object upward.