平时我们在跳绳时,绳子甩到最高处的形状可近似看做抛物线,如图

平时我们在跳绳时,绳子甩到最高处的形状可近似看做抛物线,如图建立直角坐标系,抛物线的函数表达式为,绳子甩到最高处时刚好通过站在点处跳绳的学生小明的头顶,则小明的身高为(   

A1.5m    B1.625m    C1.66m    D1.67m

答案

 A   

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