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

A disc of moment of inertia `2 kg m^2` is acted upon by a constant torque of 40 Nm. If it is initially at rest, then the time taken by it to acquire an angular velocity 100 rad/s will be

A

20 s

B

10 s

C

5 s

D

4 s

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