Problem Bonus 3 (10 points) In Fig. 9, a 1.0 g bullet is fired into a 0.50 kg block attached to the end of a 0.60 m nonuniform rod of mass 0.50 kg. The block-rod-bullet system then rotates in the plane of the figure, about a fixed axis at A. The rotational inertia of the rod alone about that axis at A is 0.060 kg . m. Treat the block as a particle. (a) What then is the rotational inertia of the block-rod-bullet system about point A ? (b) If the angular speed of the system about A just after impact is 4.5rad/s, what is the bullet's speed just before impact? Solution: A Rod Block Bullet Figure 9