## Essential University Physics: Volume 1 (3rd Edition)

We know that the average speed is given as $\omega_{avg}=\frac{\omega_i+\omega_f}{2}$ We plug in the known values to obtain: $\omega_{avg}=\frac{5800+0}{2}=2900rpm$ Now we can we find the number of revolutions as $N=(2900rpm)(\frac{2s}{60minute})=97revolutions$