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

A body constrained to move along the Z-axis of a co-ordinate system is subject to a constant forece `vec F=-hat i+2hatj+3hatk`, 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 4 m along the Z-axis ?

A

12 J

B

13 J

C

10 J

D

9 J

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The correct Answer is:
A
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