飞机着陆后滑行的距离y(单位:m)关于滑行的时间x(单位:s)的

飞机着陆后滑行的距离y(单位:m)关于滑行的时间x(单位:s)的函数解析式是y=1.2x2+48x,则飞机着陆后滑行________m后才能停下来

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