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(本题20分) (湖南湘西,25,20分)如图.抛物线 与x轴相交于点A和点B,与y轴交于点C. (1)求点A、点B和点C的坐标. (2)求直线AC的解析式. (3)设点M是第二象限内抛物线上的一点,且 =6,求点M的坐标. (4)若点P在线段BA上以每秒1个单位长度的速度从A运动(不与B,A重合),同时,点Q在射线AC上以每秒2个单位长度的速度从A 向C运动.设运动的时间为t秒,请求出△APQ的面积S与t的函数关系式,并求出当t为何值时, △APQ的面积最大,最大面积是多少?
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