Spring, Charge and Block

A small block having charge QQ placed on a frictionless horizontal table is attached to one end of a spring of force constant kk. The other end of the spring is attached to a fixed support and the spring stays horizontally in relaxed state. Another small block carrying a negative charge q-q is brought very slowly from a great distance towards the former block along the line coinciding the axis of the spring.
Find extension in the spring when both the blocks collide.

Details.and Assumptions
1)q=1q=1
2)Q=2Q=2
3)ϵ0=3\epsilon_{0}=3
4)k=4k=4

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