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
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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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