Consider a system consisting of two objects initially moving separately. The two objects collide and stick together. If the objects continue moving after crashing, what can we state about the kinetic energy
and momentum of the system before and after the crash?

A. The kinetic energy of the system has decreased.
The momentum of the system has decreased.

B. The kinetic energy of the system remains constant.
The momentum of the system remains constant.

C. The kinetic energy of the system remains constant.
The momentum of the system has decreased.

D. The kinetic energy of the system has decreased.
The momentum of the system remains constant.