Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?

By Newton’s third law, the gravitational force Earth exerts on Rahul is equal in magnitude and opposite in direction to the force Rahul exerts on Earth. The force Earth exerts on Rahul is his weight, so the matching choice is Rahul’s weight. The chair and book do not add to the force Rahul himself exerts on Earth.

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