Work, Energy and Power

A body constrained to move along the z-axis of a coordinate system is subject to a
constant force F given by
ˆ
2
ˆ ++−= 3
ˆ
kjiF N
where k ,j ,i
ˆ ˆ ˆ 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 ?