A) 38 J
B) 70J
C) 52.5 J
D) 126 J
Correct Answer: A
Solution :
[a] According to work-energy theorem, Change in kinetic energy = work done |
\[=\vec{F}.\Delta \vec{r}=\left( 7\hat{i}+4\hat{j}+3\hat{k} \right).\left( 2\hat{i}+3\hat{j}+4\hat{k} \right)\] |
\[=14+12+12=38J\] |
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