Kinematics Question 265
Question: Two vectors $ \overrightarrow{A} $ and $ \overrightarrow{B} $ are at right angles to each other, when [AIIMS 1987]
Options:
A) $ \overrightarrow{A}+\overrightarrow{B}=0 $
B) $ \overrightarrow{A}-\overrightarrow{B}=0 $
C) $ \overrightarrow{A}\times \overrightarrow{B}=0 $
D) $ \overrightarrow{A}.\overrightarrow{B}=0 $
Correct Answer: D $ \vec{A}.\vec{B}=|\vec{A}|.|\vec{B}|.\cos \theta =\vec{A}.\vec{B}.\cos 90{}^\circ =0 $
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