一物体置于粗糙的斜面上,给它施加一个平行于斜面的力当此力为100N且沿斜面向上时,物体恰能沿斜面向上匀速运动;当此力为20N且沿斜面向下时,它刚好能在斜面上向下匀速运动.求施加力前
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![一物体置于粗糙的斜面上,给它施加一个平行于斜面的力当此力为100N且沿斜面向上时,物体恰能沿斜面向上匀速运动;当此力为20N且沿斜面向下时,它刚好能在斜面上向下匀速运动.求施加力前](/uploads/image/z/13824471-39-1.jpg?t=%E4%B8%80%E7%89%A9%E4%BD%93%E7%BD%AE%E4%BA%8E%E7%B2%97%E7%B3%99%E7%9A%84%E6%96%9C%E9%9D%A2%E4%B8%8A%2C%E7%BB%99%E5%AE%83%E6%96%BD%E5%8A%A0%E4%B8%80%E4%B8%AA%E5%B9%B3%E8%A1%8C%E4%BA%8E%E6%96%9C%E9%9D%A2%E7%9A%84%E5%8A%9B%E5%BD%93%E6%AD%A4%E5%8A%9B%E4%B8%BA100N%E4%B8%94%E6%B2%BF%E6%96%9C%E9%9D%A2%E5%90%91%E4%B8%8A%E6%97%B6%2C%E7%89%A9%E4%BD%93%E6%81%B0%E8%83%BD%E6%B2%BF%E6%96%9C%E9%9D%A2%E5%90%91%E4%B8%8A%E5%8C%80%E9%80%9F%E8%BF%90%E5%8A%A8%EF%BC%9B%E5%BD%93%E6%AD%A4%E5%8A%9B%E4%B8%BA20N%E4%B8%94%E6%B2%BF%E6%96%9C%E9%9D%A2%E5%90%91%E4%B8%8B%E6%97%B6%2C%E5%AE%83%E5%88%9A%E5%A5%BD%E8%83%BD%E5%9C%A8%E6%96%9C%E9%9D%A2%E4%B8%8A%E5%90%91%E4%B8%8B%E5%8C%80%E9%80%9F%E8%BF%90%E5%8A%A8.%E6%B1%82%E6%96%BD%E5%8A%A0%E5%8A%9B%E5%89%8D)
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