A body constrained to move along the z-axis of a co-ordinate system in subjected to a constant force

A body constrained to move along the z-axis of a co-ordinate system in subjected to a constant force F given by
F=-1î+2j+3k N
where î , j and 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 existence of 4 m along the z-axis.

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