A bag of mass M hangs by a long thread and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then for the combined system (bag + bullet)

Options

A. momentum is m `Mv"/"(M+m)`
B. `KE" is "(1/2)Mv^(2)`
C. Momentum is m `Mv"/"(M+m)M`
D. `KE" is "m^(2)v^(2)"/"2 (M+m)`

Answer

D