A particle of mass \( m \) is moving with constant velocity \( v \) parallel to the \( x \)-axis...

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A particle of mass \( m \) is moving with constant velocity \( v \) parallel to the \( x \)-axis as shown in the figure. Its angular momentum about origin \( O \) is
(1) \( m v b \)
(2) mva
(3) \( m v \sqrt{a^{2}+b^{2}} \)
(4) \( m v(a+b) \)
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