$\"\"$ \ \

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

Find the work done by the force when $\"\"$ .

The displacement between the two points is $\"\"$ .

Therefore, $\"\"$ .

The work done by the force is $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, the work done by the force $\"\"$ is $\"\"$ .

$\"\"$

The work done is $\"\"$ .