$\"\"$

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Work done is $\"\"$ , Where F is the force and u is the position vector.

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Position vector :

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If the initial point $\"\"$ and the terminal point is $\"\"$ , then

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the position vector is $\"\"$ .

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$\"\"$

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Force vector is $\"\"$

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The points are $\"\"$ and $\"\"$ .

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The position vector is $\"\"$ .

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Substitute the points $\"\"$ and $\"\"$ .

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$\"\"$

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The position vector is $\"\"$ .

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The work done is $\"\"$

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

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$\"\"$

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The work done is $\"\"$ .

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$\"\"$

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The work done is $\"\"$ .