A) 8 J
B) 11 J
C) 5 J
D) 2 J
Correct Answer: C
Solution :
\[\overset{\to }{\mathop{s}}\,=\overset{\to }{\mathop{{{r}_{2}}}}\,-\overset{\to }{\mathop{{{r}_{1}}}}\,=(4\hat{j}+3\hat{k})-(-2\hat{i}+5\hat{j})\] \[=2\hat{i}-\hat{j}+3\hat{k}\] \[\overset{\to }{\mathop{F}}\,=4\hat{i}+3\hat{k}\] \[W=\overset{\to }{\mathop{F}}\,.\overset{\to }{\mathop{S}}\,=8-3=5J\]
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