如图所示,质量均为m的两个小球,分别用两根等长的细线悬挂在O点

如图所示,质量均为m的两个小球,分别用两根等长的细线悬挂在O点,两球之间夹着一根劲度系数为k的轻弹簧,静止时弹簧是水平的,若两根细线之间的夹角为,则弹簧的形变量为

A.            B.

C.            D.

答案

A


解析:

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