Is Angular Momentum Conserved About Point O?

[princejan7]

Homework Statement

http://postimg.org/image/qghh7y1vr/

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

 

[Simon Bridge]

can someone explain why angular momentum is conserved about O?

... without looking: because that's the Law.

<looking>
What makes you think it might not be?