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General
Easy
Question
Two masses A and B of mass M and 2M respectively are connected by a compressed ideal spring. The system is placed on a horizontal frictionless table and given a velocity u
in the z-direction as shown in the figure. The spring is then released. In the subsequent motion the line from B to A always points along the 
unit vector. At some instant of time mass B has a x-component of velocity as 
. The velocity 
of as A at that instant is
The correct answer is:
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