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M1 please help super easy

Also .
https://pmt.physicsandmathstutor.com/download/Maths/A-level/M1/Papers-Edexcel-Tiered/11%20Gold%201%20-%20M1%20Edexcel.pdf In q1 here , how do I know which direction the particles vare moving in after the collision , and how do I know which has the higher velocity ?
So, if they both move in the same direction, you should realise that the particle 'at the front' must be moving faster then the one behind it.

Then consider the impulse of each particle on the other. Does the particle with least momentum carry on moving in the same direction, or must it change direction?

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