A boy carries a bucket of water of weight 80N while walking 25m on a horizontal path.
(i) Find the work done by the boy on the bucket during the walk.
(ii) The boy now drags the same bucket on the ground by pulling it with a constant horizontal force of 80N through the same distance of 25m. Calculate the work done by him in this case.
(iii) Compare your answers to parts (i) and (ii) and briefly explain the reason for any difference observed.