如图所示,在水平传送带上有三个质量分别为m1、m2、m3的木块1、2、3

如图所示,在水平传送带上有三个质量分别为m1m2m3的木块123,中间分别用一原长为L、劲度系数为k的轻弹簧连接起来,木块与传送带间的动摩擦因数为,现用水平细绳将木块1固定在左边的墙上,传送带按图示方向匀速运动,当三个木块达到平衡后,12两木块之间的距离是( )

A Lm2g/k

B L(m2+m3)g/k

C L(m1+m2+m3)g/k                 

D Lm1g/k

答案

B

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