A) \[\sqrt{5}\]
B) \[\sqrt{3}\]
C) \[0\]
D) \[1\]
E) \[\sqrt{2}\]
Correct Answer: D
Solution :
\[|\overrightarrow{a}-\overrightarrow{b}{{|}^{2}}=|\overrightarrow{a}{{|}^{2}}+|\overrightarrow{b}{{|}^{2}}-2|\overrightarrow{a}||\overrightarrow{b}|\cos \theta \] \[\Rightarrow \]\[|\overrightarrow{a}-\overrightarrow{b}{{|}^{2}}=1+1-2\cos 60{}^\circ \] \[=2-1\] \[\Rightarrow \] \[|\overrightarrow{a}-\overrightarrow{b}|=1\]
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