.如图所示是健身用的”跑步机”示意图一质量为m的运动员踩在与水平面成角的静止皮带上,运动员用力向后蹬皮带,皮带运动过程中受到的阻力如为f,使皮带以速度v 匀速向后运动.则
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![.如图所示是健身用的”跑步机”示意图一质量为m的运动员踩在与水平面成角的静止皮带上,运动员用力向后蹬皮带,皮带运动过程中受到的阻力如为f,使皮带以速度v 匀速向后运动.则](/uploads/image/z/8174612-20-2.jpg?t=%EF%BC%8E%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E6%98%AF%E5%81%A5%E8%BA%AB%E7%94%A8%E7%9A%84%E2%80%9D%E8%B7%91%E6%AD%A5%E6%9C%BA%E2%80%9D%E7%A4%BA%E6%84%8F%E5%9B%BE%E4%B8%80%E8%B4%A8%E9%87%8F%E4%B8%BAm%E7%9A%84%E8%BF%90%E5%8A%A8%E5%91%98%E8%B8%A9%E5%9C%A8%E4%B8%8E%E6%B0%B4%E5%B9%B3%E9%9D%A2%E6%88%90%26%2361537%3B%E8%A7%92%E7%9A%84%E9%9D%99%E6%AD%A2%E7%9A%AE%E5%B8%A6%E4%B8%8A%2C%E8%BF%90%E5%8A%A8%E5%91%98%E7%94%A8%E5%8A%9B%E5%90%91%E5%90%8E%E8%B9%AC%E7%9A%AE%E5%B8%A6%2C%E7%9A%AE%E5%B8%A6%E8%BF%90%E5%8A%A8%E8%BF%87%E7%A8%8B%E4%B8%AD%E5%8F%97%E5%88%B0%E7%9A%84%E9%98%BB%E5%8A%9B%E5%A6%82%E4%B8%BAf%2C%E4%BD%BF%E7%9A%AE%E5%B8%A6%E4%BB%A5%E9%80%9F%E5%BA%A6v+%E5%8C%80%E9%80%9F%E5%90%91%E5%90%8E%E8%BF%90%E5%8A%A8%EF%BC%8E%E5%88%99)
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