Final answer:
The concept of work as defined in physics is true because the work-energy theorem states that work done on an object is equal to the change in kinetic energy.
Step-by-step explanation:
The statement that is true about the concept of work, as defined in physics, is option c. Yes, because the work-energy theorem states that work done on an object is equal to the change in kinetic energy, and change in KE requires a change in velocity. It is assumed that mass is constant.
The work-energy theorem states that the amount of work done on an object is equal to the change in its kinetic energy. This means that if there is a change in velocity, there must have been work done to cause that change. However, it is important to note that mass is assumed constant in this theorem.