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【简答题】
有一个截面边缘为抛物线形的拱形桥洞，桥洞离水面的最大高度为4m，跨度为10m．把它的截面边缘的图形放在如图所示的直角坐标系中． （1）直接写出抛物线的顶点坐标； （2）求这条抛物线所对应的函数关系式； （3）如图，在对称轴右边2m处，桥洞离水面的多少？
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