15.质量为4kg的物体a放在水平桌面上利用图6所示的装置使物体以2ms的速度做匀速直线运动弹簧测力计拉力f始终保持水平弹簧测力计的示 Template




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tomski15.质量为4kg的物体a放在水平桌面上利用图6所示的装置使物体以2ms的速度做匀速直线运动弹簧测力计拉力f始终保持水平弹簧测力计的示 coloring