The Force of Gravity of a Person or Object at the Surface of a Planet is Known as _____.

The force of gravity of a person or object at the surface of a planet is known as _____.

(A) mass.
(B) air resistance.
(C) inertia.
(D) weight.

Correct option is D. Explanation: The force of gravity of a person or object at the surface of a planet is known as weight.