A bullet moving with a velcity u passes ...

A bullet moving with a velcity u passes through a plank which is free to move. The two are of equal mass. After pssing through the plank, the velocity of the bullet becomes `fu`. Its velocity relative to the plank now is

`fu`

`(1-f)u`

`(2f-1)u`

`(2-f)u`

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