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?
A) 2
B) 0.5
C) −0.5
D) −2

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The Answer of 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?
A) 2
B) 0.5
C) −0.5
D) −2

A Ceiling Fan Is Turned on and Reaches an Angular