3.如图在“探究弹性势能的表达式 活动中为计算弹簧弹力所做的功把拉伸弹簧的过程分为很多小段拉力在每小段可以认为是恒力用各小段做功的 Template




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tomski3.如图在“探究弹性势能的表达式 活动中为计算弹簧弹力所做的功把拉伸弹簧的过程分为很多小段拉力在每小段可以认为是恒力用各小段做功的 coloring