39. A solid cylinder of mass 2 kg and radius 0.2m is rotating about its own axis without friction with angular velocity 3 rad/s . A particle of mass 0.5 kg and moving with a velocity 5 m/s strikes the cylinder and sticks to it as shown in figure. The angular momentum of the cylinder before collision will be
(a) 0.12 J–s
(b) 12 J–s
(c) 1.2 J-s
(d) 1.12 J-s
Ans. a
(10)