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Three children are sitting on a see-saw in such a way that is balances. A \( 20 \mathrm{~kg} \) and a \( 30 \mathrm{~kg} \) boy are on opposite sides at a distance of \( 2 \mathrm{~m} \) from the pivot. It the third boy jumps off, thereby destroying balance, then the initial angular acceleration of the board is (Neglect weight of board)
(1) \( 0.01 \mathrm{rad} \mathrm{s}^{-2} \)
(2) \( 1.0 \mathrm{rad} \mathrm{s}^{-2} \)
(3) \( 10 \mathrm{rad} \mathrm{s}^{-2} \)
(4) \( 100 \mathrm{rad} \mathrm{s}^{-2} \)
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