A 5-Kg Object Is Moving to the Right at 4

Multiple Choice

A 5-kg object is moving to the right at 4 m/s and collides with another object moving to the left at 5 m/s.The objects collide and stick together.After the collision,the combined object:

A) is moving to the right.
B) is moving to the left.
C) is at rest.
D) has less kinetic energy than the system had before the collision.