Jessica explains to Josh that she is not clear on the concept of completely inelastic collisions. She asks Josh if this means that all kinetic energy is lost in a completely inelastic collision. Josh replies that he is not sure, but remembers that in completely inelastic collisions the two objects stick together after the collision. He reasons that if the objects are to stick together and all the kinetic energy is lost, then the two trains would be at rest and connected. They decide to run the simulation several times with the \"degree of elasticity\" set to a completely inelastic collision. From these simulations they decide that - Jessica is incorrect. There are no possible initial conditions where the two trains remain at rest after a completely inelastic collision. - in an inelastic collision both trains stick together and move as one afterward. Completely inelastic does not mean that all of the kinetic energy is lost in the collision. O - Jessica is correct. The trains stick together and remain at rest after the collision - Josh is incorrect. The two trains do not stick together after a completely inelastic collision.