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## Homework Statement

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.

## Homework Equations

They say

**a**= -ω

_{B}^{2}

_{AB}

**R**

_{B/A}iI used

**a**=

_{B}**a**+ α

_{A}**k**x

**r**- ω

^{2}

**r**

_{B/A}## The Attempt at a Solution

So obviously mine will be a different answer, I only found

**a**but it gave me an

_{B}**i**and

**j**component because of that cross product. Which one is correct and why? Why can they neglect the cross product?