The angular speed in rpm will be 6. Angular speed is defined as the ratio of the revolution in the given time interval.
The rate of change of angular displacement is defined as angular speed.
ω = n/t
Where,
n is the number of revolution
t is the time
ω is the angular speed
ω = n/t
ω = 18/6
ω = 3 rpm
Hence,the angular speed in rpm will be 6 .
To learn more about the angular speed, refer to the link;
https://brainly.com/question/9684874
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