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“验证机械能守恒定律”的实验中.图(甲)是打点计时器打出的一条纸带,选取其中连续的计时点标为A、B、C……G、H、I,对BH段进行研究. ①已知打点计时器电源频率为50Hz,则纸带上打相邻两点的时间间隔为_______. ②用刻度尺测量距离时如图(乙),读出A、C两点间距为_________ cm,B点对应的速度v B=_________m/s(保留三位有效数字); ③若H点对应的速度为v H,重物下落的高度为h BH,当地为g,为完成实验,要比较
与_________________大小(用字母表示).
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