Kinematics Question 268
Question: The angle between two vectors $ -2\hat{i}+3\hat{j}+\hat{k} $ and $ \hat{i}+2\hat{j}-4\hat{k} $ it’s [EAMCET 1990]
Options:
A) 0°
B) 90°
C) 180°
D) None of the above
Correct Answer: B $ \cos \theta =\frac{\vec{A}.\vec{B}}{|\vec{A}||\vec{B}|}=\frac{-2+6-4}{\sqrt{14}\sqrt{21}}=0 $ \ $ \theta =90{}^\circ $
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