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F(r)=cr/|r^3|

where c is some constant. r = xi + yj + zk. Find the work done by F in moving an object from a point P1 along a path to a point P2 in terms of the distances d1 and d2 from those points to the origin.

I'm not exactly sure how to do this or even where to start?

Usually F denotes a vector field, but in case it doesn't...?

Any help would be greatly appreciated!