In a free space a rifle on mass `M` shoots a bullet of mass `m` at a stationary block of mass `M` distance `D` away from it . When the bullet has moved through a distance `d` towards the block the centre of mass of the bullet `-` block system is at a distance of `:`

Options

A. `(m(D+d))/(M+m)`
B. `(d(M+m))/(M)`
C. `(M(D-d))/(M+m)`
D. None of these

Answer

D