AB是圆O的直径,弦BC=4cm,F是弦BC的中点,∠ABC=60°,若动点E以2cm/s的速度从A点出发沿A→B→A的方向,设运动时间为t(s)(0≤t<6),连接EF,当△BEF是直角三角形时,t的值____
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![AB是圆O的直径,弦BC=4cm,F是弦BC的中点,∠ABC=60°,若动点E以2cm/s的速度从A点出发沿A→B→A的方向,设运动时间为t(s)(0≤t<6),连接EF,当△BEF是直角三角形时,t的值____](/uploads/image/z/10688602-58-2.jpg?t=AB%E6%98%AF%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E5%BC%A6BC%3D4cm%2CF%E6%98%AF%E5%BC%A6BC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E2%88%A0ABC%3D60%C2%B0%2C%E8%8B%A5%E5%8A%A8%E7%82%B9E%E4%BB%A52cm%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E4%BB%8EA%E7%82%B9%E5%87%BA%E5%8F%91%E6%B2%BFA%E2%86%92B%E2%86%92A%E7%9A%84%E6%96%B9%E5%90%91%2C%E8%AE%BE%E8%BF%90%E5%8A%A8%E6%97%B6%E9%97%B4%E4%B8%BAt%28s%29%280%E2%89%A4t%EF%BC%9C6%29%2C%E8%BF%9E%E6%8E%A5EF%2C%E5%BD%93%E2%96%B3BEF%E6%98%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E6%97%B6%2Ct%E7%9A%84%E5%80%BC____)
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