Final answer:
The incorrect statement about an elastic collision is that the total energy changes during the collision. In such a collision, momentum and kinetic energy are conserved, meaning they do not change.
Step-by-step explanation:
The statement that is incorrect regarding an elastic collision is 'D) Total energy changes during collision'. In an elastic collision, both momentum and kinetic energy are conserved, which means they are the same before and after the collision. Objects do bounce off each other in an elastic collision.
In the situation of two objects of equal mass where object A moves with a certain velocity and object B is initially at rest, if after the collision object A comes to rest and object B moves with some unknown velocity, only momentum is conserved. The kinetic energy would not be conserved if object A comes to a complete rest because kinetic energy is a function of both mass and velocity, and having one of the objects stop means some of the system's kinetic energy was converted into another form of energy (possibly sound, heat, or deformation energy).