如图所示用f为30n的拉力通过�轮组拉着重为300n的物体在水平面上以05ms的速度�左做匀速直线运动.则物体受到的�擦力大小为 Template




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tomski如图所示用f为30n的拉力通过�轮组拉着重为300n的物体在水平面上以05ms的速度�左做匀速直线运动.则物体受到的�擦力大小为 coloring