Kinematics Question 446
Question: Given $ \vec{A}=\hat{i}+\hat{j}+\hat{k} $ and $ \vec{B}=-\hat{i}-\hat{j}-\hat{k},(\vec{A}-\vec{B}) $ will make angle with $ \vec{A} $ as
Options:
A) $ 0{}^\circ $
B) $ 180^{o} $
C) $ 90{}^\circ $
D) $ 60{}^\circ $
Correct Answer: A [a] $ \vec{A}-\vec{B}=2\hat{i}+2\hat{j}+2\hat{k}=2\vec{A} $
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