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Two masses A and B of mass M and 2M resp...

Two masses A and B of mass M and `2M` respectively are connected by a compressed ideal spring. The system in placed on a horizontal frictionless table and given a velocity `uhat(k)` in the z-direction as shown in the figure. The spring is then released. In the subsequent motion the line from B to A alwyas points along the `hat(i)` unit vector. All some instant of time mass B has a x-component of velocity as `v_(x)hat(i)`. The velocity `vec(v)_(A)` of mass A at that instant is :-

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