Best Answer: Recall that if any vector that is a scalar multiple of v has the same direction as v. In the case of making a unit vector that has the same direction as v, we need to divide v by its magnitude; the resulting vector is parallel to v (as it is a scalar multiple of v since |v| is just a scalar), and has magnitude 1 (since dividing a vector by its magnitude gives a vector of length 1).
Since 8i has length 8, the required unit vector is:
(1/8)v = (1/8)(8i) = i.
V = j. Um... Ok. The vector given goes immediately in a single path from the beginning. The unit vector has magnitude of 1. So, take a vector going straight within the same path (straight positive on the j axis, with out a i aspect) that has magnitude one.