| 1 | We write it subject to conservation of mass. | |
| 2 | Is it lost, in violation of the conservation principle? | |
| 3 | I turn to equation number five, which is the conservation of mechanical energy. | |
| 4 | Let's try the conservation of mechanical energy. | |
| 5 | So the conservation of momentum tells you what the speed is after the collision. |
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