题目

He has already p to his boss that his theory can be putinto practice. 答案：【1】proved 如图所示，质量为3 kg的物体A在与水平方向成37°角，大小为30 N的拉力F的作用下，在水平面上从静止开始做匀变速直线运动，当物体的速度达6 m/s时位移为3 m(取g＝10 m/s2) (1)求物体与地面之间的动摩擦因数？ (2)当速度达6 m/s时撤去拉力，求拉力撤去后再经2 s物体A的位移？(sin37°＝0.6，cos37°＝0.8)