A book is kept over a table. The weight of the book is balanced by the normal reaction force applied by the table. Which of the given statement(s) is/are correct with regard to this situation?

Normal reaction force is equal but not opposite to the weight of the book.

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Normal reaction force and the weight of the book are not action– reaction pairs.

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Both A and B are correct statements.

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Normal reaction force is equal and opposite to the weight of the book.

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Solution

The correct option is C Both A and B are correct statements.
The normal reaction force balances the weight of the book and is, therefore, equal and opposite to the weight. However, action–reaction forces act between the same pair of bodies. The weight of a book is a force applied by the earth, whereas a normal reaction force is applied by the table on the book.

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