Halliday, Resnick & Walker — Rolling, Torque, and Angular Momentum: Problem 61

61 The uniform rod (length 0.60 m, mass 1.0 kg) in Fig. 11-49 rotates in the plane of the figure about an axis through one end, with a rotational inertia of \(0.12 \text{ kg} \cdot \text{m}^2\). As the rod swings through its lowest position, it collides with a \(0.20 \text{ kg}\) putty wad that sticks to the end of the rod. If the rod’s angular speed just before collision is \(2.4 \text{ rad/s}\), what is the angular speed of the rod-putty system immediately after collision?