Kinematics Question 40
Question: The vectors $ 5i+8j $ and $ 2i+7j $ are added. The magnitude of the sum of these vector is [BHU 2000]
Options:
A) $ \sqrt{274} $
B) 38
C) 238
D) 560
Correct Answer: A Sum of the vectors $ \overrightarrow{R}=5\hat{i}+8\hat{j}+2\hat{i}+7\hat{j} $ $ =7\hat{i}+15\hat{j} $ magnitude of $ \overrightarrow{R}=|\overrightarrow{R}|=\sqrt{49+225} $ $ =\sqrt{274} $
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