A ceiling-mounted trolley moves a lighting unit using a vertical cable. The cable exerts a constant upward force of 45 N on the lighting unit. The unit is raised vertically by 1.2 m, moved horizontally, and then raised vertically by a further 0.8 m.
The trolley could move the lighting unit a greater distance horizontally between the two vertical movements. Explain why this would not change the total work done by the force from the cable.
Calculate the total work done by the force from the cable during the journey.