When two objects collide, which of the following could happen?

In a collision, several outcomes are possible depending on the characteristics of the objects involved (such as mass, velocity, shape, and material properties) and the type of collision (elastic or inelastic).

The scenario where both objects end up stationary or lock together and move off is possible in inelastic collisions. In such collisions, momentum is conserved, but kinetic energy is not necessarily conserved. This means that the two objects can collide and stick together due to the effects of friction or other forces, resulting in a common velocity as they move off together.

Additionally, it's important to note that some collisions may result in the objects being momentarily stationary, particularly in perfectly inelastic collisions where they stick together, thereby absorbing some momentum and energy. This aligns with the option that describes multiple outcomes effectively, including both the possibility of locking together and moving off or coming to a stop when external forces are negligible after the collision.

This reflects the complexity of real-world collisions, whereas the other options describe more specific or limited situations that do not account for the wide range of potential outcomes in such events.