A rod of mass \( m \) and length \( 2 R \) is fixed along the diameter of a ring of same mass \(...

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A rod of mass \( m \) and length \( 2 R \) is fixed along the diameter of a ring of same mass \( m \) and radius \( R \) as shown in figure. The combined body is rolling without slipping along \( x \)-axis. Find the angular momentum about \( z \)-axis.
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