What will happen with the speed of a body if other bodies cease to act on it or their action is compensated for, is not predictable if you do not know how exactly they interact. For example, if the tractor stops pulling the trailer, the trailer will stop, and vice versa, if the tractor does not have to pull the trailer, its speed will increase. Therefore, the answer is: it is impossible to say for sure.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.