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In the system in figure, the blocks have...

In the system in figure, the blocks have masses `m_(1)` and `m_(2)` , the spring constant is `k`, coefficient of friction between the block 1 and the surface is `mu`. The system is released with zero initial speed from the position where the spring is not stretched.

A

`3cm`

B

`6cm`

C

`9cm`

D

`15cm`

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