A bullet moving with a velocity \( u \) passes through a plank P wh...

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A bullet moving with a velocity \( u \) passes through a plank
P which is free to move. The two are of equal mass. After passing through the plank, the velocity of the bullet becomes \( f u \). Its
W. velocity relative to the plank now is :
(A) \( f u \)
(B) \( (1-f) u \)
(C) \( (2 f-1) u \)
(D) \( (2-f) u \)
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