In which way can a moving object maintain its speed according to Newton's 2nd Law?

The concept of maintaining speed in the context of Newton's 2nd Law is fundamentally linked to the idea that an object will continue in motion at a constant speed in a straight line unless acted upon by an external force. This is known as inertia, which is encapsulated in Newton's first law of motion. When analyzing how a moving object can maintain its speed, it's important to understand that if no net external force is acting on the object, there will be no change in its velocity, meaning it will continue at the same speed and direction.

In contrast, options like using friction effectively or continuous thrust imply that there are active forces involved which could either slow down or speed up a moving object, depending on their nature. Similarly, magnetic interference suggests an external force that could disrupt the motion. Therefore, the correct interpretation grounded in Newton's laws highlights that the key to maintaining speed is the absence of any net forces acting on the object.