1.

An object of mass 3m splits into three equal fragments. Two fragments have velocities \[v\hat{j}\] and \[v\hat{i}\]. The velocity of the third fragment is    [UPSEAT 2004]

A.        \[v(\hat{j}-\hat{i})\]      
B.        \[v(\hat{i}-\hat{j})\]
C.        \[-v(\hat{i}+\hat{j})\]   
D.        \[\frac{v(\hat{i}+\hat{j})}{\sqrt{2}}\]
Answer» D.        \[\frac{v(\hat{i}+\hat{j})}{\sqrt{2}}\]


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