A) 8
B) 10
C) 12
D) 16
Correct Answer: A
Solution :
Work done \[W=\vec{F}.\vec{r}\] \[=(2\hat{i}+\hat{j}-\hat{k}).[3\hat{i}+2\hat{j}-2\hat{k}\] \[-(2\hat{i}-\hat{j}+\hat{k})]\] \[=(2\hat{i}+\hat{j}-\hat{k}).(\hat{i}+3\hat{j}-3\hat{k})\] \[=2+3+3\] \[=8\,\text{unit}\]You need to login to perform this action.
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