In a Game of Pool, the White Cue Ball Hits

Multiple Choice

In a game of pool, the white cue ball hits the 5 ball and stops, while the 5 ball moves away with the same velocity as the cue ball had originally. The type of collision is

A) inelastic.
B) elastic.
C) elastic or inelastic, depending on the mass of the balls.
D) completely inelastic.