Two blocks of masses 10 kg and 4 kg are ...

Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of `14 m//s` to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

`30 " ms"^(-1)`

`20 " ms"^(-1)`

`10 " ms"^(-1)`

`5 " ms"^(-1)`

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