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A body constrained to move along the z-a...

A body constrained to move along the z-axis of a coordinate system is subject to a constant force F given by
`F= -hati+2hatj+3hatk N`
where `hati, hatj, hatk` 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 4m along the z-axis?

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`= 12 J`
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