## Fundamentals of Physics Extended (10th Edition)

$\omega_f=10rad/s$
The instantaneous angular velocity is the angular velocity at the end of the 5 seconds. This value can be determined with the equation: $\omega_f=\omega_0+\alpha t$ Since the disc started at rest, $\omega_0=0rad/s$ Substituting the angular acceleration from part (a), we get: $\omega_f=\alpha t=(2rad/s^2)(5s)=10rad/s$