Two identical ball bearings in contact with each other and resting on a frictionless table is hit head-on by another ball bearing of the same time moving initially with a speed \(v\) as shown in the figure.
If the collision is elastic, which of the following (as depicted in the figure) is a possible result after collision?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
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