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Two blocks of masses 5kg and 2kg are con...

Two blocks of masses 5kg and 2kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse provides a velocity of 7m/s to the heavier block in the direction of the lighter block. The velocity of the centre of mass is :-

A

`4m//s`

B

`5m//s`

C

`2m//s`

D

`3m//s`

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