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

The correct answer is

Rahul’s weight

In fact, the force Rahul exerts on Earth corresponds to the force of gravity. But Rahul's weight is, in fact, the force of gravity exerted by the Earth on Rahul, and these two forces correspond to the action-reaction pair of Newton's third law, which states that the two forces are equal.

Using formulas, Rahul's weight is equal to

where m is Rahul mass and g is the gravitational acceleration (g=9.81 m/s^2).