Question $18(3\mathrm{.}5$ points$)$

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A $349$ kg box is pulled $5\mathrm{.}00$ m up a $30$ frictionless, inclined plane by an external force of $4725$ N that acts parallel to the plane. Calculate the work $W_{\text{e}\text{x}\text{t}\text{d}\text{o}\text{n}\text{e}by\text{t}\text{h}\text{e}\text{e}\text{x}\text{t}\text{e}\text{r}\text{n}\text{a}\text{l}\text{f}\text{o}\text{r}\text{c}\text{e}\text{.}}$

$20500$ J

$0$ J

$23600$J

$11800$ J