Question

A hammer of mass 200g is dropped from the top of a roof of the two storey building to the ground. Another hammer of equal mass fell from a coffee table to the ground. Given than the height of the two storey building and the coffee table are 10 m and 5 m respectively.
a. Show that a hummer dropped from two storey building roof does more work than a hammer falling from a coffee table.
b. Calculate the potential energy from the two heights.