如图甲是某同学利用电磁打点计时器研究小滑块运动的实验中获得的一条纸带，纸带左端与滑块相连接，打点计
\u5982\u56fe1\u6240\u793a\uff0c\u67d0\u540c\u5b66\u5229\u7528\u7535\u78c1\u6253\u70b9\u8ba1\u65f6\u5668\u6253\u51fa\u7684\u7eb8\u5e26\u6765\u9a8c\u8bc1\u673a\u68b0\u80fd\u5b88\u6052\u5b9a\u5f8b\uff0c\u8be5\u540c\u5b66\u5728\u5b9e\u9a8c\u4e2d\u7b49\u5230\u4e00\u6761\u7eb8\u5e26\uff0c\u5982\uff081\uff09A\u3001\u5c06\u6253\u70b9\u8ba1\u65f6\u5668\u63a5\u5230\u4ea4\u6d41\u7535\u6e90\u4e0a\uff0c\u4e0d\u80fd\u4f7f\u7528\u5e72\u7535\u6c60\uff0e\u6545A\u9519\u8bef\uff1bB\u3001C\u3001\u5b9e\u9a8c\u65f6\u5e94\u5148\u6253\u5f00\u6253\u70b9\u8ba1\u65f6\u5668\uff0c\u7136\u540e\u677e\u5f00\u7eb8\u5e26\uff0e\u6545B\u9519\u8bef\uff0cC\u6b63\u786e\uff1bD\u3001\u7eb8\u5e26\u5e94\u7406\u987a\uff0c\u7a7f\u8fc7\u9650\u4f4d\u5b54\u5e76\u4fdd\u6301\u7ad6\u76f4\uff0c\u4ee5\u51cf\u5c0f\u9650\u4f4d\u5b54\u5bf9\u7eb8\u5e26\u7684\u6469\u64e6\u529b\uff0e\u6545D\u6b63\u786e\uff0e\u6545\u9009\uff1aCD\uff082\uff09\u70b92\u7684\u77ac\u65f6\u901f\u5ea6\u7b49\u4e8e1\u30013\u4e4b\u95f4\u7684\u5e73\u5747\u901f\u5ea6\uff0c\u6240\u4ee5\uff1av2=S12T \uff083\uff09\u7269\u4f53\u5728\u70b92\u7684\u52a8\u80fd\uff1aEk2=12mv22=12m\u00d7\uff08S12T\uff092=12\u00d70.5\u00d7\uff080.042\u00d70.02\uff092=0.25J\uff1b\u7269\u4f53\u5728\u70b95\u7684\u52a8\u80fd\uff1aEk5=12mv25=12\u00d70.5\u00d7\uff08S22T\uff092=12\u00d70.5\u00d7\uff080.082\u00d70.02\uff092=2.0m\u8d28\u91cf\u4e3am\u7684\u91cd\u7269\u4ece\u70b92\u8fd0\u52a8\u5230\u70b95\u8fc7\u7a0b\u4e2d\uff0c\u52a8\u80fd\u589e\u52a0\u91cf\uff1a\u25b3Ek=Ek5-Ek2=2.0m-0.5m=1.0J\uff1b\u56e0\u6b64\u52a8\u80fd\u589e\u52a0\u91cf\u4e3a\u25b3Ek=1-0.25=0.75J\uff1b\u52bf\u80fd\u51cf\u5c11\u91cf\uff1a\u25b3EP=mgs3=0.5\u00d710\u00d70.1600=0.78J\uff0e\u6545\u7b54\u6848\u4e3a\uff1a\uff081\uff09CD\uff1b\uff082\uff09S12T\uff1b\uff083\uff090.75\uff0c0.78\uff0e
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（1）实验室常用的电磁式打点计时器用的是低压交流电源；电磁式打点计时器用电源频率为50HZ．即每隔0.02s打一个点，所以AB时间间隔0.08s
（2）图中连续四段位移之差均为0.2cm，根据连续相等时间间隔内，位移之差等于常数可判断物体做匀变速直线运动．
（3）AB段的平均速度
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