1. The problem statement, all variables and given/known data 2. Relevant equations a⋅(b x a) = 0 3. The attempt at a solution Is my working below correct? In particular, can you apply the rCB to both the first part of the bracket (0.2j) and the second part (w x rCB) individually like that? My second question relates to: Is that correct? Does it matter if rCB is multiplied at the end or start? I am inclined to think it doesn't as it's a dot product?