A porter carries a luggage bag of mass 8kg up a flight of stairs that rises 2.0m in three equal steps, each of vertical height 0.67m.
a. (a) Calculate the work done in each step and hence the total work done by the porter.
b. (b) How much work would be required if the same bag were lifted straight up through 2.0m at once?
c. (c) Comment on whether the two answers differ.