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A body A, of mass \[m\text{ }=\text{ }0.1\text{ }kg\] has an initial velocity of \[3\hat{i}\,m{{s}^{1}}\]. It collides elastically with another body, B of the same mass which has an initial velocity of\[5\hat{j}\text{ }m{{s}^{1}}\]. After collision, A moves with a velocity \[\vec{v}=4\left( \hat{i}+\hat{j} \right)\] . The energy of B after collision is written as \[\frac{x}{10}J.\]  the value of x is ________. [JEE MAIN Held On 08-01-2020 Morning]

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