高考物理：万有引力加简谐运动，落入地心隧道的小球会怎么动？请证明你的结论。做简谐运动的条件是什么？一个视频给你讲清楚所有的关系和计算流程。
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| MP4 | N/A | 480P | Download |
| MP4 | N/A | 360P | Download |
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| MP4 | N/A | mp4a.40.2 | Download |
| MP4 | N/A | mp4a.40.5 | Download |
| MP4 | N/A | mp4a.40.2 | Download |
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