小明用20n的水平推力推着重为50n的木箱在水平地面上做匀速直线运动则地面对木箱的�擦力大小为 N.若小明将推力增大到30n时木箱受到的 Template




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tomski小明用20n的水平推力推着重为50n的木箱在水平地面上做匀速直线运动则地面对木箱的�擦力大小为 n.若小明将推力增大到30n时木箱受到的 coloring