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A variable force of an object is $\"\"$ pounds, when it is $\"\"$ feet from the origin.

Find the work done in moving the object along the straight line from $\"\"$ ft to $\"\"$ ft.

Work done formula:

Work done in moving the object from $\"\"$ to $\"\"$ is $\"\"$ .

Where, $\"\"$ is a variable force acts on an object.

Here $\"\"$ pounds, $\"\"$ ft and $\"\"$ ft.

Work done is $\"\"$ .

$\"\"$

$\"\"$ feet-pounds.

Work done is $\"\"$ ft-lb.

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Work done is $\"\"$ ft-lb. \ \