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General
Easy
Question
Two blocks of equal mass m are connected by an unstretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force F is applied on the first block ' A ' pulling it away from the other block 'B' as shown in figure at t=0. Extension of the spring is 
at time t.
Displacement of the centre of mass at time t is
The correct answer is:
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