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A light rigid rod of length 4 m is conne...

A light rigid rod of length `4 m` is connected rigidly with two identical particles each of mass `m = 2 kg`. the free end of the rod is smoothly pivoted at `O`. The rod is released from rest from its horizontal position at `t = 0`. Find the

angular acceleration of the rod at `t = 0` (in `rad s^(-2)).`

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