The 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 space craft will have a velocity :
A. `(MV)/(M-m)`
B. `(MV)/(M+m)`
C. `(mV)/(M-m)`
D. `((M+m)V)/(m)`
