According to Newton's First Law, what happens to an object at rest?

Newton's First Law, also known as the law of inertia, states that an object at rest will remain at rest unless acted upon by a net external force. This means that if no unbalanced forces are acting on the object, it will not change its state of motion, which includes staying stationary. This principle highlights the concept that it requires an external influence to change the motion of an object, whether it is at rest or moving.

The other options do not correctly represent Newton's First Law. Starting to move at high speed suggests that an object can spontaneously accelerate without a force, which contradicts the law. Similarly, the idea of decay implies a change over time that is not due to an external force, and changing direction spontaneously indicates motion can occur without the influence of a force, which is also not in accordance with the law.