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A disc of moment of inertia 3 kg m^2 is ...

A disc of moment of inertia `3 kg m^2` is acted upon by a constant torque of 60 Nm, if the disc is at rest, then the time after which the angular velocity of the disc is 90 rad/s, will be

A

1.5 s

B

3s

C

4.5 s

D

6 s

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