3 Answers
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During the first two seconds, the object is at 20 rad/s
20 / 2 * pi (3.1416) = 3.183 revolutions/s
3.183 * 2 = 6.37 revolutions in 2 seconds.
After, the speed drop to 10 rad/s
10 / 2*pi = 1.59 revolution/s
1.59 * 1.1 = 1.75 revolutions between 2 and 3.1 seconds
6.37 + 1.75 = 8.12 revolutions.
It has done 8 revolutions in the first 3.1s
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8 Revolutions
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you ****** up