Answer:
\[W=\int\limits_{2}^{4}{F\,dx}=\int\limits_{23}^{4}{10\,{{x}^{2}}\,\,dx}=\left[
\frac{10{{x}^{3}}}{3} \right]_{2}^{4}=\frac{10}{3}\left[ {{4}^{3}}-{{2}^{3}}
\right]=\frac{10}{3}\times 56=186.7J\]
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