Two billiard balls undergo a head-on col...

Two billiard balls undergo a head-on collision. Ball 1 is twice as heavy as ball 2. Initially, ball 1 moves with a speed `v` towards ball 2 which is at rest. Immediately after the collision, ball 1 travels at a speed of `v//3` in the same direction. What type of collision has occured?

Inelastic

Elastic

Completely inelastic

Cannot be determined from the information given

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