A) \[360J\]
B) \[240J\]
C) \[-240J\]
D) \[-360J\]
Correct Answer: A
Solution :
[a] \[\operatorname{w}=\int\limits_{{{x}_{1}}}^{{{x}_{2}}}{Fdx}=\int\limits_{4}^{-2}{-6{{x}^{3}}dx}\] \[=-6{{\left| \frac{{{x}^{4}}}{4} \right|}^{-2}}_{4}=\frac{-6}{4}\left[ {{\left( -2 \right)}^{4}}-{{\left( 4 \right)}^{2}} \right]=360J.\]
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