A wheel starting from rest is rotating with a constant angular acceleration of 3.0 rad s^-2.An observer notes that it traces an angle of 120 radiation in 40 second interval.For how long the wheel had been rotated when the observer started his observation?

A wheel starting from rest is rotating with a constant angular acceleration of 3.0 rad s^-2.An observer notes that it traces an angle of 120 radiation in 40 second interval.For how long the wheel had been rotated when the observer started his observation?

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