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A physics book rests on a table top. A gravitational force pulls down on the book.
According to Newton's third law, the force that is equal to this gravitational force is
the force the table exerts upward on the book.
the force the book exerts downward on the table.
the force the table exerts downward on the floor.
the force the book exerts upward on the earth.
the force the air pressure exerts down on the book.