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A 2kg block slides on a horizontal floor...

A `2kg` block slides on a horizontal floor with the a speed of `4m//s` it strikes a uncompressed spring , and compresses it till the block is motionless . The kinetic friction force is compresses is `15 N` and spring constant is `10000 N//m` . The spring by

A

`8.5 cm`

B

`5.5 cm`

C

`2.5 cm`

D

`11.0 cm`

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