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Two blocks of equal mass m are connected...

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 pulling away from the other as shown in Fig.

Then the displacement of the centre of mass in at time `t` is

A

`(Ft^(2))/(2m)`

B

`(Ft^(2))/(3m)`

C

`(Ft^(2))/(4m)`

D

`(Ft^(2))/(m)`

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