further mechanics 1 edexcel alevel help :D

hello, i hope everyone is doing well! i need help on part 3 ii to this question. i have worked out the angle of the velocity of b after the collision but im not sure as in what to do next? i thought the angle they were asking for is the angle between the initial and final velocity of b but that wasn’t right.


https://pmt.physicsandmathstutor.com/download/Maths/A-level/M3/Papers-OCR/June%202014%20QP%20-%20M3%20OCR.pdf

Could you post your working please?

hi, sorry! i edited it + attached it

I think you've misinterpreted the angle they want.

90 - 53.1 = 36.9

then 36.9 - 21.8