A man is instructed to carry a package from the base camp at B to summit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If `g = 10 m//s^(2)`, (i) how much work does man do against gravity ?
(ii) what is the potential energy of the package at A if it is assumed to be zero at B ?