Final answer:
Force is not simply a product of an object moving at a certain speed; it would require a resistive force to calculate a force necessary to maintain that speed. Without additional information, such as acceleration or a resistive force, no force calculation can be made from the given data.
Step-by-step explanation:
The question asks for the force exerted by an object in motion; however, it might be a misconception because force is not something an object in motion simply has by virtue of moving at a certain speed. But if we are talking about the force required to maintain the object's movement at a constant speed of 20 m/s, that would be related to an external force countering any resistive forces like friction. In the absence of friction or if the object is in a vacuum, no additional force would be needed to maintain that speed, as per Newton's First Law of Motion.
In the context of a specific situation where force is needed to change the object's state of motion, we could refer to Newton's Second Law of Motion, F = ma, where F is the force applied, m is the mass, and a is the acceleration. If the object's velocity changes, and we know the time over which that change happens, we can calculate acceleration and thus the necessary force. Without this information, we cannot calculate the force required from the data given (mass of 30 kg moving at 20 m/s).