Question

rahul sits in a chair reading a book. which force is equal to the force rahul exerts on earth?
rahuls weight
rahuls mass
the sum of the weights of rahul and the book
the sum of the weights of the chair, rahul, and the book

Explanation:

According to Newton's third - law of motion, for every action, there is an equal and opposite reaction. Rahul's weight is the force exerted on him by Earth due to gravity. The force Rahul exerts on Earth is equal in magnitude to his weight. His mass is a measure of the amount of matter in him and is not a force. The sums of weights of multiple objects are not relevant here as we are only considering the interaction between Rahul and Earth.

Answer:

Rahul's weight