一学生用80N的力将重为5N的足球沿水平方向踢出20m，则该同学对球做

一学生用80N的力将重为5N的足球沿水平方向踢出20m，则该同学对球做的功是

A．1700J B．100J C．1600J D．无法确定

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一学生用80N的力将重为5N的足球沿水平方向踢出20m，则该同学对球做

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