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A ball of mass $m$ is released from rest from position A, as shown in the figure above.

After falling from a height $h$, what is the magnitude of the angular momentum of the ball about C when it reaches Point B?

$ ml\sqrt {2gh} $

$ ml\sin\theta \sqrt {2gh} $

$ m l \cos\theta \sqrt {2gh} $

$ m l \sin\theta \sqrt {gh} $

$ m l\cos\theta \sqrt {gh} $