$A$ spacecraft of mass $M$ moves with velocity $V$ in free space at first,then it explodes breaking into two pieces. If after explosion a piece of mass $m$ comes to rest,the other piece of spacecraft will have a velocity
- A$\frac{MV}{M - m}$
- B$\frac{MV}{M + m}$
- C$\frac{mV}{M - m}$
- D$\frac{mV}{M + m}$
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