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In the figure, a 0.400 kg ball is shot directly upward at initial speed 31.8 m/s....

In the figure, a 0.400 kg ball is shot directly upward at initial speed 31.8 m/s. What is its angular momentum about P, 6.09 m horizontally from the launch point, when the ball is (a) at maximum height and (b) halfway back to the ground?

I only need part B

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