A square shaped block of mass m travels to the right with velocity v on a frctionless table surface. The block has side-length 2a. The block hits a very small, immovable obstacle on the edge of the table and starts to tip.

The block has moment of inertia I=(2/3)ma^2 about an axis through its center of mass and perpendicular to its face.

What is the magnitude of angular momentum L of the block with respect to the two reference point shown in the figure? Answer in terms of some or all of the variables a, b, m, and v.

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