A student is carrying a stack of books. Its mass is 3.2 kg.
(a)[2]
Calculate the weight of the pile of books.
(b(i))[3]
Show that the work done on the books as they are taken to the top of the stairs is about 140 J.
(b(ii))[2]
Determine the increase in gravitational potential energy of the books, and state why.
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