A body constrained to move along the z-axis of a coordinate system is subject to a constant force F

A body constrained to move along the z-axis of a coordinate system is subject to a
constant force F given by
F = -i + 2j + 3k N I j k are unit vectors along the x-, y- and z-axis of the system respectively.
What is the work done by this force in moving the body a distance of 4 m along the
z-axis ?
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