A bag of mass `M` hangs by a long massless rope. A bullet of mass in, moving horizontally with velocity `u`, is caught in the bag. Then for the combined (bag `+` bullet) system, just after collision

Options

A. Momentum is `(mvM)/(M+m)`
B. kinetic energy is `(mv^(2))/(2)`
C. Momentum is `(mv(M+m))/(M)`
D. kinetic energy is `(m^(2)v^(2))/(2(M+m))`

Answer

D