【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
如图为验证机械能守恒定律的实验打下的纸带,纸带上的点都是连续打下的点.已知打点计时器所用交流电源周期为T,为g.量得1、2、3各点到起点O的长度是:h1,h2,h3.已知重锤质量为m,从起点O到2点重锤重力势能减少量为______,动能增加量为______.事实上重锤重力势能的减少量与动能的增加量不会严格相等,主要误差原因是______.(写出一条即可)
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