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What is the center of mass of the object below?

The shape is uniformly dense.

All answers are stated with respect to the origin, which is at the lower left corner of the object.

A

$(\cfrac { 2 }{ 3 } a,\cfrac { 4 }{ 3 } a)$

B

$(a,a)$

C

$(\cfrac { 2 }{ 3 } a,\cfrac { 2 }{ 3 } a)$

D

$(\cfrac { 4 }{ 3 } a,\cfrac { 4 }{ 3 } a)$

E

$(\cfrac { 5 }{ 6 } a,\cfrac { 5 }{ 6 } a)$

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