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A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. ...
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A ceiling fan is turned on and reaches an angular speed of 120 rev/min in 20 s. It is then turned off and coasts to a stop in an additional 40 s. The ratio of the average angular acceleration for the first 20 s to that for the last 40 s is which of the following?
50%
50%
0%
0%