关于探究功和物体速度变化的关系的实验中，下列说法正确的是：A

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关于探究“功和物体速度变化的关系”的实验中，下列说法正确的是：

A．每次实验必须算出橡皮筋对小车做功的具体数值

B．实验中小车和木板间存在摩擦，实验前需要平衡摩擦力

C．实验中应先释放小车后通电

D．每次实验中，橡皮筋拉伸的长度不用保持一致

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