A block Q of mass 2m is placed on a hori...

A block Q of mass 2m is placed on a horizontal frictionless plane. A second block of mass m is placed on it and is connected to a spring of spring constant K, the two block are pulled by distance A. Block Q oscillates without slipping. The work done by the friction force on block Q when the spring regains its natural length is:

`1/3 KA^(2)`

`2/3 KA^(2)`

`1/2 KA^(2)`

`1/4 KA^(2)`

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