Mass is the amount of matter in a material while weight is a measure of how the force of gravity acts upon the mass.
Answer:
kidney
Explanation:
thats where your pee goes through
The change in potential energy of an object is given by

where
m is the mass of the object
g is the gravitational acceleration

is the increase in altitude of the object
In our problem,

is the mass of the book,

and

is the increase in altitude of the book, so its variation of potential energy is
It should go to the same height if its not interacting with air