Question

Harish presses a book weighing 0.1 kg which is kept on a table by 5 N force through his hand. What reaction force will the book apply back (g=9.8 m/s2)

Answer 1

I think it will be 5N, due to Newton's third law:

If object A exerts a force on object B,  object B will exert an equal, but opposite force on object A.

I'm not 100% sure on how to use all the info in the quesiton, but i hope that helps.

Answer 2

5 Newton force will be applied back.

• As per Newton's third law of motion, every action has equal and opposite reaction.
• So, when the force of 5 Newton is being applied on the book, the same amount of force will be applied back which will be reaction force.
• Therefore, 5 Newton reaction force will be applied back by the book.