(c) $\omega = \frac{d\theta}{dt} = \frac{d}{dt}\left( 2t^{3} + 0.5 \right) = 6t^{2}$ At $t = 2\ s,\ \omega = 6 \times (2)^{2} = 24\ rad/s$
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Ph.D. in Physics with 19+ years of teaching experience.