Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of
A. 2 N exerted by the book on the hand.
B. 10 N exerted by the Earth on the book.
C. 10 N exerted by the book on the hand.
D. 10 N exerted by the book on the Earth.
E. 12 N exerted by the book on the hand.
Answer: E
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