A Bullet of mass m is fired with a velocity ν onto a block of wood of mass M and initially at rest. The final velocity of the system will be
(A) [m/ (m .+ M)]ν
(B) [M/ (m + M)]ν
(C) [(m +M)/ m]ν
(D) [(m + M)/ M]ν
Answer is (A) [m/ (m .+ M)]ν
Apply the law of conservation of momentum.
