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  4. A force (3 hati+2 hatj) N displaces an object through a distance (2 hati+3 hatj) m. The work done will be:

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Q. A force $ (3\hat{i}+2\hat{j}) $ N displaces an object through a distance $ (2\hat{i}+3\hat{j}) $ m. The work done will be:

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Solution:

Work done is given by $ W=\overrightarrow{F}\times \overrightarrow{s}=(3\hat{i}+2\hat{j}).(2i-3j) $ $ =6-6=0J $