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A marble of mass X collides with a block of mass Z, with a velocity Y. and sticks to it. The final velocity of the system is
(A)
\(\frac{Y}{X+Y}Y\)
(B)
\(\frac{X}{X+Z}Y\)
(C)
\(\frac{X+Y}{Z}\)
(D)
\(\frac{X+Z}{X}\)