质量分别为 m 1 和 m 2 的两滑块 A 和 B 通过一轻弹簧水平连结后置于水平桌面上,滑块与桌面间的滑动摩擦系数均为 m ,系统在水平拉力 F 作用下匀速运动,如图所示.如突然撤消拉力,则刚撤消后瞬间,二者的加速度 a A 和 a B 分别为()
A.
a A = 0 , a B = 0 ;
B.
a A > 0 , a B < 0 ;
C.
a A < 0 , a B> 0 ;
D.
a A < 0 , a B=0
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