A particle is moving in a circle of radius \( r \) centred at \( O \) with constant speed \( v \...

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A particle is moving in a circle of radius \( r \) centred at \( O \) with constant speed \( v \). The change in velocity in moving from \( A \) to \( B \) is [Given \( \angle A O B=40^{\circ} \) ]
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