1.

The resultant of vectors \[\overrightarrow{\text{P}}\text{ }\]and \[\overrightarrow{\text{Q}}\] is \[\overrightarrow{\text{R}}\]. On reversing the direction of \[\overrightarrow{\text{Q}}\], the resultant vector becomes \[\overrightarrow{S}\]. Then, correct relation is    

A. \[~{{R}^{2}}+{{S}^{2}}=({{P}^{2}}+{{Q}^{2}})\]        
B. \[{{R}^{2}}+{{S}^{2}}={{P}^{2}}+{{Q}^{2}}\,\]
C. \[{{R}^{2}}+{{P}^{2}}={{S}^{2}}+{{Q}^{2}}\]                     
D. \[{{P}^{2}}+{{S}^{2}}=2\,({{Q}^{2}}+{{R}^{2}})\]
Answer» B. \[{{R}^{2}}+{{S}^{2}}={{P}^{2}}+{{Q}^{2}}\,\]


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