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安徽省2024-2025学年九年级上学期教学质量调研一(无标题)物理试卷答案试卷答案

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安徽省2024-2025学年九年级上学期教学质量调研一(无标题)物理试卷答案第一部分

6.如图,一侧有竖直挡板的足够长的实验台固定在地面上,台面水平且光滑.质量均为m=0.4kg的甲、乙两小球用一根劲度系数为k=20N/m的轻质弹簧栓接在一起,小球乙与竖直挡板接触(不固定),用力推压小球甲使弹簧压缩,弹簧压缩量为x1=0.2m时锁定小球甲.现解除对小球甲的锁定,同时给小球甲施加一个水平向左的外力F,,使小球甲由静止开始向左以a=10m/s^2的加速度做匀加速直线运动,当小球乙刚要离开竖直挡板时撤掉外力F.有关甲、乙两小球的运动情况的判断,下列说法正确的是A.外力F的最大值为Fm=6NB.弹簧锁定时弹性势能为Ep=0.6JC.小球乙刚离开挡板瞬间小球甲的速度大小为2m/sD.外力F对小球甲做的功为WF=0.6J

安徽省2024-2025学年九年级上学期教学质量调研一(无标题)物理试卷答案第二部分（待更新）

(2)某同学在实验中得到如图乙所示的一条纸带(两计数点间还有四个计时点没有画出),已知打点计时器的频率为50Hz,根据纸带可求出小车的加速度大小为2.00m/s^2(结0.150.09果保留3位有效数字);Ro.02-2