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can anyone help me with that, ty
Explanation verified by Alloprof
This Explanation was verified by a member of the Alloprof team.
I believe that you must be at a level higher than is indicated under your pseudo name.
i, j, and k are used mostly to represent an orthogonal basis of unit vectors (vectors whose norm are one)
they are associated with the x, y and z axes
they can also be represented by (1, 0, 0) (0, 1, 0) and (0, 0, 0)
and r can be represented by (x, y, z).
As I have not done much vector calculations recently I would suggest that you consult the following site or the notes from your own course