A block of mass m moves on a horizontal rough surface with initial velocity v. The height of the center of mass of the block is h from t
surface. Consider a point a on the surface in line with the center of mass.
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The line of motion of block passes through the center of mass and indicates the motion of center of mass. Hence, angular momentum about A is mvh initially. Since, block is moving on a horizontal rough surface, due to frictional force block will stop moving after some time. Hence, the velocity of the block decreases as time passes and due to this angular momentum is not conserved about A
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