Answer
The initial angular speed of the fan is $157.3rad/s$.
Work Step by Step
We have $\alpha=-42rad/s^2$, $\omega=83.8rad/s$ and $t=1.75s$
The initial angular speed of the fan is $$\omega_0=\omega-\alpha t=157.3rad/s$$
Physics (10th Edition)
by Young, David; Stadler, Shane
Published by
Wiley
ISBN 10:
1118486897
ISBN 13:
978-1-11848-689-4
Chapter 8 - Rotational Kinematics - Problems - Page 216: 67
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