Answer
$9 \ J$
Work Step by Step
The work done on a object can be found as:
$W=\int_a^b F(x) \ dx$
This implies that
$W=\int_0^3 2x \ dx \\=\dfrac{1}{2}\times 2 \times |x^2|_0^3 \\=(3)^2-0\\=9 \ J$
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