The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 4500 revolutions per minute. The angular acceleration of the wheel is
A
30degrees/sec2
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B
1880degrees/sec2
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C
40degrees/sec2
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D
1980degrees/sec2
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Solution
The correct option is D1980degrees/sec2 Angular acceleration (a) = rate of change of angular speed =2π(n2−n1)t=2π(4500−120060)10=2π33006010×3602πdegreesec2=1980degree/sec2.