## Physics (10th Edition)

a) $\overline\omega =0.15rad/s$ b) $\overline\omega =-0.2rad/s$ c) $\overline\omega =-0.6rad/s$ d) $\overline\omega =0.4rad/s$
The average angular velocity is calculated by $$\overline\omega = \frac{\Delta\theta}{\Delta t}$$ a) $$\overline\omega = \frac{\Delta\theta}{\Delta t}=\frac{0.75rad-0.45rad}{2s}=0.15rad/s$$ b) $$\overline\omega = \frac{\Delta\theta}{\Delta t}=\frac{0.54rad-0.94rad}{2s}=-0.2rad/s$$ c) $$\overline\omega = \frac{\Delta\theta}{\Delta t}=\frac{4.2rad-5.4rad}{2s}=-0.6rad/s$$ d) $$\overline\omega = \frac{\Delta\theta}{\Delta t}=\frac{3.8rad-3rad}{2s}=0.4rad/s$$