A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book ............ $^o$
A book is lying on the table. What is the angle between the action of the book on the table and the reaction of the table on the book ............ $^o$
- A
$0$
- B
$30$
- C
$45$
- D
$180$
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