1. The problem statement, all variables and given/known data I was checking my work and Chegg uses the equations differently. Can somebody tell me why? Maybe I'm misunderstanding how/why to use the equation I chose. 2. Relevant equations They say aB = -ω2ABRB/Ai I used aB = aA + αk x r - ω2rB/A 3. The attempt at a solution So obviously mine will be a different answer, I only found aB but it gave me an i and j component because of that cross product. Which one is correct and why? Why can they neglect the cross product?