A) 2
B) 4
C) 6
D) 8
Correct Answer: D
Solution :
\[AB=\overrightarrow{r}=\overrightarrow{{{r}_{1}}}-\overrightarrow{{{r}_{2}}}\] \[=(3\hat{i}+5\hat{j})-(-5\hat{i}-3\hat{j})\] \[=(8\hat{i}+8\hat{j})m\] \[\overrightarrow{v}=\overrightarrow{{{v}_{2}}}-\overrightarrow{{{v}_{1}}}\] \[=(a\hat{i}+7\hat{j})-(4\hat{i}+3\hat{j})\] \[=(a-4)\hat{i}+4\hat{j}\] \[\overrightarrow{v}=\frac{\overrightarrow{r}}{t}\] \[(a-4)\overrightarrow{i}+\overrightarrow{4j}=\frac{8\hat{i}+8\hat{j}}{2}\] \[a=8\]You need to login to perform this action.
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