Physics

Problem

A book of weight 20 N rests on a horizontal table and remains at rest. Which one of the following statements about the forces on the book is correct? a) The table exerts an upward force greater than

20\,\text{N}

to keep the book at rest. b) The table exerts a downward force of

20\,\text{N}

on the book (action equals reaction). c) The table exerts an upward force of

20\,\text{N}

on the book. d) Because the net force is zero, no forces actually act on the book.

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