Step-by-Step Solution
Solution 1
The gravitational potential energy of the book is 
. Here, 
is the mass of the book, 
is the acceleration due to gravity and 
is the height.
Work done in lifting the book to a height is equal to the gravitation potential energy stored in the book. Substitute 
, 
and 
Hence, option (B), (C) and (D) are incorrect answers.
The potential energy of the book is 
.
Hence, option 
is the correct answer.
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