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A body A, of m=0.1 kg has a initial velo...

A body A, of m=0.1 kg has a initial velocity of `3hatikms^(-1)`. It collides elastically with another body. B of the same mass which has an initial velocity of `5hatjms^(-1)`. After collision, A moves with a velocity `vec(v)=4(hati+hatj)`. The energy of B after collision is written as `(x)/(10)J`. The value of x is.

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