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

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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+3KN
where 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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is vector product of two vectors equal to magnitude of work??

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