A) 100 J
B) 50 J
C) 200 J
D) 75 J
Correct Answer: A
Solution :
Using the formula for work done \[W=\overrightarrow{F}\cdot \overrightarrow{r}=\overrightarrow{F}\cdot (\overrightarrow{{{r}_{2}}}-\overrightarrow{{{r}_{1}}})\] \[W=(4\hat{i}+\hat{j}+3\hat{k})\cdot (14\hat{i}+13\hat{j}+9\hat{k}-3\hat{i}-2\hat{j}+6\hat{k})\] \[W=(4\hat{i}+\hat{j}+3\hat{k})\cdot (11\hat{i}+11\hat{j}+15\hat{k})\] \[W=44+11+45=100\,joule\]You need to login to perform this action.
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