Which statement explains how gravity and inertia work together? a. they change the motion of objects. b. they take turns working on objects. c. they keep all objects moving at the same speed. d. they prevent objects from moving in a circular motion.

Therefore, A.They change the motion of objects.

Explanation:

Gravity force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Inertia : is a property of matter by which it continues in its existing uniform motion in a straight line, unless that state is changed by an external force.

there are no contact forces mentioned on the list of choices that you've provided.

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