Dynamic equilibrium describes a state in which a body is:

Dynamic equilibrium specifically refers to a situation where an object is in motion but maintains a constant velocity. This means that the magnitude and direction of the object's velocity remain unchanged over time. In this state, the forces acting on the object are balanced, resulting in no net force acting on it. Consequently, there are no changes in speed or direction, which is characteristic of dynamic equilibrium.

In scenarios where an object is at rest or experiences constant acceleration, the conditions do not meet the criteria for dynamic equilibrium. An object at rest with no external forces is in static equilibrium, while constant acceleration indicates that the velocity of the body is changing, thus it cannot be described as being in dynamic equilibrium. Lastly, an object that is continuously changing direction is experiencing a net force, meaning it is not balanced and therefore does not fulfill the requirements of dynamic equilibrium.