游艇从河岸的A出出发渡河,游艇艇身垂直渡河时,经过时间t1=10min游艇到达正对岸下游s=120m的C处.如果游艇保持原来速度大小逆水斜向上游与河岸成a角方向行驶,则经过时间t2=12.5min游艇恰好到达
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![游艇从河岸的A出出发渡河,游艇艇身垂直渡河时,经过时间t1=10min游艇到达正对岸下游s=120m的C处.如果游艇保持原来速度大小逆水斜向上游与河岸成a角方向行驶,则经过时间t2=12.5min游艇恰好到达](/uploads/image/z/8339261-5-1.jpg?t=%E6%B8%B8%E8%89%87%E4%BB%8E%E6%B2%B3%E5%B2%B8%E7%9A%84A%E5%87%BA%E5%87%BA%E5%8F%91%E6%B8%A1%E6%B2%B3%2C%E6%B8%B8%E8%89%87%E8%89%87%E8%BA%AB%E5%9E%82%E7%9B%B4%E6%B8%A1%E6%B2%B3%E6%97%B6%2C%E7%BB%8F%E8%BF%87%E6%97%B6%E9%97%B4t1%3D10min%E6%B8%B8%E8%89%87%E5%88%B0%E8%BE%BE%E6%AD%A3%E5%AF%B9%E5%B2%B8%E4%B8%8B%E6%B8%B8s%3D120m%E7%9A%84C%E5%A4%84.%E5%A6%82%E6%9E%9C%E6%B8%B8%E8%89%87%E4%BF%9D%E6%8C%81%E5%8E%9F%E6%9D%A5%E9%80%9F%E5%BA%A6%E5%A4%A7%E5%B0%8F%E9%80%86%E6%B0%B4%E6%96%9C%E5%90%91%E4%B8%8A%E6%B8%B8%E4%B8%8E%E6%B2%B3%E5%B2%B8%E6%88%90a%E8%A7%92%E6%96%B9%E5%90%91%E8%A1%8C%E9%A9%B6%2C%E5%88%99%E7%BB%8F%E8%BF%87%E6%97%B6%E9%97%B4t2%3D12.5min%E6%B8%B8%E8%89%87%E6%81%B0%E5%A5%BD%E5%88%B0%E8%BE%BE)
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