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Analyzing the errors in instantaneous velocity measured with photogate timer

ZHOU Yong,LI Geng-lei,ZHENG Xiao-ping(College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China)  
With the example of the experiment of validating the conservation law of mechanical energy using single pendulum,the errors in the instantaneous velocity of the pendulum measured with photogate timer are analyzed with two methods. The conclusion is that the values of the instantaneous velocity measured with photogate timer in some experiments are smaller than the real ones.
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