A particle is projected with velocity 'u' makes an angle $\theta w.r.t $horizontal. Now it breaks in two identical parts at highest point of trajectory. If one part is retrace its path, then velocity of other part is -

Question

( A ) $2 u \cos \theta $
( B ) $2 u \ cos \theta $
( C ) $3 u \cos \theta $
( D ) u