（12＇）如图，在离水面高度5米的岸上有人用绳子拉船靠岸，开始时

（12＇）如图，在离水面高度5米的岸上有人用绳子拉船靠岸，开始时绳子与水面的夹角为30°，此人以每秒0.5米收绳，问：8秒后，船向岸边移动了多少米？（结果保留根号）

答案

（－）米

解析:略

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（12＇）如图，在离水面高度5米的岸上有人用绳子拉船靠岸，开始时

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