Kinematics Question 151

Question: Unit vector parallel to the resultant of vectors $ \vec{A}=4\hat{i}-3\hat{j} $ and $ \vec{B}=8\hat{i}+8\hat{j} $ will be [BHU 1995]

Options:

A) $ \frac{24\hat{i}+5\hat{j}}{13} $

B) $ \frac{12\hat{i}+5\hat{j}}{13} $

C) $ \frac{6\hat{i}+5\hat{j}}{13} $

D) None of these

Show Answer

Answer:

Correct Answer: B

Solution:

Resultant of vectors $ \overrightarrow{A} $ and $ \overrightarrow{B} $

$ \overrightarrow{R}=\overrightarrow{A}+\overrightarrow{B}=4\hat{i}-3\hat{j}+8\hat{i}+8\hat{j} $

$ =12\hat{i}+5\hat{j} $

$ \hat{R}=\frac{\overrightarrow{R}}{|R|}=\frac{12\hat{i}+5\hat{j}}{\sqrt{{{(12)}^{2}}+{{(5)}^{2}}}} $

$ =\frac{12\hat{i}+5\hat{j}}{13} $



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