用如图所示装置拉同一物体,在同一水平面上做匀速直线运动,已知

用如图所示装置拉同一物体,在同一水平面上做匀速直线运动,已知物重40 N,摩擦力为10 N,则F1 =        N;F2 =          N。

答案

p;  

 

 
【答案】10,5。解析:

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