A Bullet of Mass M and Velocity Strikes and Becomes

Multiple Choice

A bullet of mass m and velocity strikes and becomes imbedded in a wooden block of mass M,which is initially at rest on a frictionless surface.The ratio of the velocity of the system after collision to the initial velocity of the bullet is

A) (M + m) /m
B) (M + m) /M
C) M/(m + M)
D) m/(m + M)
E) M/(m - M)