A Particle of Mass M = 0

Multiple Choice

A particle of mass m = 0.10 kg and speed v0 = 5.0 m/s collides and sticks to the end of a uniform solid cylinder of mass M = 1.0 kg and radius R = 20 cm. If the cylinder is initially at rest and is pivoted about a frictionless axle through its centre, what is the final angular velocity (in rad/s) of the system after the collision?

A) 8.1
B) 2.0
C) 6.1
D) 4.2
E) 10