The angular position of a line of a disc...

The angular position of a line of a disc of radius r = 6cm is given by `theta=10 - 5t +4t^2` rad , the average angular velocity between 1 and 3s is

`pi "rad "s ^(-1)`

`11 "rad "s ^(-1)`

`22 "rad "s ^(-1)`

`5.5 "rad "s ^(-1)`

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