A ball, rolling purely on a horizontal floor with centres speed \( v \), hits a smooth vertical ...

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A ball, rolling purely on a horizontal floor with centres speed \( v \), hits a smooth vertical wall surface elastically. Answer the following questions.
The change in angular momentum of the solid ball (mass \( m \), radius \( R \) ), about the corner point of floor and wall, due to the collision is
(1) \( 2 m v R \)
(2) \( m v R \)
(3) \( m v R / 2 \)
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