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A flywheel whose moment of inertia about...

A flywheel whose moment of inertia about its axis of rotation is `16kg-m^(2)` is rotating freely in its own plane about a smooth axis through its centre. Its angular velocity is `9rads^(-1)` when a torque is applied to bring it to rest in `t_(0)` seconds find `t_(0)` if
(a). The torque is constant and of magnitude 4`N-m`
(b). The magnitude of the torque after `t` second is given by `kt`.

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