为了验证小球在竖直平面内摆动过程的机械能是否守恒
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为了验证小球在竖直平面内摆动过程的机械能是否守恒，利用如图(a)装置，不可伸长的轻绳一端系住一小球，另一端连接力传感器，小球质量为m，球心到悬挂点的距离为L，小球释放的位置到最低点的高度差为h，实验记录轻绳拉力大小随时间的变化如图(b)，其中Fm是实验中测得的最大拉力值，重力加速度为g，请回答以下问题：
(1)小球第一次运动至最低点的过程，重力势能的减少量△Ep=___________，动能的增加量△Ek=___________。(均用题中所给字母表示)
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我国宪法规定宪法的修改由全国人民代表大会常务委员会
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2021年2月3日 pm1:12
根据图像可知小球做周期性的摆动每次经过最低点时
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