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according to newton's third law.
Every action has an equal and opposite reaction.
The book exerts a reaction force of 10N on the table.
the table exerts an opposite reaction force of -10N on the table.
minus just shows that the force exerted by surface is in opposite direction to the actual force applied.
FAB= -FBA
Please approve
given that the weight of the book is 10N
as the book is placed on the table the weight(mg)is balanced by the normal reaction force applied on the book by the table
therefore mg=N=10N
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here you have not mentioned about friction
there is no friction in the above case as the book is at stationary with respect to the table
the formula for frictional force is the product of the normal force on the body(N) and the coefficient of friction which will be given in the problen itself
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