Hello s7bThe first line segment is in the plane ; the force is in the direction of the -axis, and it moves along the line in the plane from to . So as the point of application of the force moves from to work done = .

To find the work done, then, you'll need to evaluate , where

The second part of the movement is parallel to the -axis, and is therefore at right angles to the force. So it does a zero amount of work.

Grandad