起重机吊着重物上升当钢丝绳对重物向上的拉力为F时重物加速度为a如果钢丝绳的拉力变为2F时重物加速度为A一定等于2a B一定大于2a C一定小于2a而大于a D一定小于a
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![起重机吊着重物上升当钢丝绳对重物向上的拉力为F时重物加速度为a如果钢丝绳的拉力变为2F时重物加速度为A一定等于2a B一定大于2a C一定小于2a而大于a D一定小于a](/uploads/image/z/2439198-54-8.jpg?t=%E8%B5%B7%E9%87%8D%E6%9C%BA%E5%90%8A%E7%9D%80%E9%87%8D%E7%89%A9%E4%B8%8A%E5%8D%87%E5%BD%93%E9%92%A2%E4%B8%9D%E7%BB%B3%E5%AF%B9%E9%87%8D%E7%89%A9%E5%90%91%E4%B8%8A%E7%9A%84%E6%8B%89%E5%8A%9B%E4%B8%BAF%E6%97%B6%E9%87%8D%E7%89%A9%E5%8A%A0%E9%80%9F%E5%BA%A6%E4%B8%BAa%E5%A6%82%E6%9E%9C%E9%92%A2%E4%B8%9D%E7%BB%B3%E7%9A%84%E6%8B%89%E5%8A%9B%E5%8F%98%E4%B8%BA2F%E6%97%B6%E9%87%8D%E7%89%A9%E5%8A%A0%E9%80%9F%E5%BA%A6%E4%B8%BAA%E4%B8%80%E5%AE%9A%E7%AD%89%E4%BA%8E2a+B%E4%B8%80%E5%AE%9A%E5%A4%A7%E4%BA%8E2a+C%E4%B8%80%E5%AE%9A%E5%B0%8F%E4%BA%8E2a%E8%80%8C%E5%A4%A7%E4%BA%8Ea+D%E4%B8%80%E5%AE%9A%E5%B0%8F%E4%BA%8Ea)
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