m Perspective View Top View Top View Figure 1 Figure 2 A disk of mass m slides with negligible friction to the right with speed v, on a horizontal table. The disk collides elastically with a uniform rod of length / that is at rest and free to pivot about one end, as shown in Figure 1 above. The disk rebounds to the left with speed vy. and the rod rotates with friction and stops at a final angle Of from its initial position, as shown in Figure 2. 4. Immediately after the collision, the rod has angular speed , and the rod comes to rest a time Ar after the collision. If the rotational inertia of the rod about the pivot is /, the average torque exerted on the rod by friction while the rod is coming to rest is IW (A) At 210) (B) (C) IN (D) 210 IAI 5. Which of the following describes the direction of the forces exerted by the disk and rod on each other during the collision? Direction of Force Exerted on Disk by Rod Direction of Force Exerted on Rod by Disk (A) Down and to the left To the right (B) To the left To the right (C) Down and to the left Up and to the right (D) To the left Up and to the right