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## Homework Statement

http://postimg.org/image/qghh7y1vr/ [Broken]

can someone explain why angular momentum is conserved about O?

## Homework Equations

M(P) = d/dt (h(P)) + v(P) x mv(G)

h(P) = I(G)w + r(G/P) x mv(G)

## The Attempt at a Solution

edit: nvm, I got it

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