$\"\"$

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Find the center of mass by using the formula.

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Center of mass along $\"\"$ -axis is $\"\"$ .

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Here, $\"\"$ are masses and $\"\"$ are $\"\"$ -coordinates.

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$ .