1.

If \[|{{\overrightarrow{V}}_{1}}+{{\overrightarrow{V}}_{2}}|\,=\,|{{\overrightarrow{V}}_{1}}-{{\overrightarrow{V}}_{2}}|\]and \[{{V}_{2}}\] is finite, then      [CPMT 1989]

A.                 \[{{V}_{1}}\] is parallel to \[{{V}_{2}}\]  
B.                                 \[{{\overrightarrow{V}}_{1}}={{\overrightarrow{V}}_{2}}\]         
C.                 \[{{V}_{1}}\] and \[{{V}_{2}}\] are mutually perpendicular
D.                                 \[|{{\overrightarrow{V}}_{1}}|\,=\,|{{\overrightarrow{V}}_{2}}|\]
Answer» D.                                 \[|{{\overrightarrow{V}}_{1}}|\,=\,|{{\overrightarrow{V}}_{2}}|\]


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