In a One-Dimensional Collision

Multiple Choice

In a one-dimensional collision,

A) a moving object strikes a stationary object, after which the objects move in arbitrary directions.
B) the objects must be moving along the same line before the collision, but may be moving in arbitrary directions after the collision.
C) one of the objects must remain at rest after the collision.
D) one of the objects must be at rest before the collision.
E) all motion, both before and after the collision, must be along the same line.