Newton's First Law says that an object at rest will remain at rest, and an object in motion will remain in motion unless it is acted on by an outside force. This is the law of_______

A. velocity
B. gravity
C. momentum
D. inertial

D. inertial

The correct answer is D. inertial.

The correct answer is D. inertial.

To determine the answer, we need to understand Newton's First Law. It states that an object at rest will remain at rest, and an object in motion will remain in motion unless acted on by an outside force. This means that an object's motion remains unchanged unless something external influences it. This concept is known as inertia, and Newton's First Law is often referred to as the law of inertia.

So, the correct answer is D. inertial.