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Brook Taylor
The OP PM'd me and I replied with the following, just in case anyone else was wondering how to do the question:



Edit: I forgot to mention how to do the second part of the question, finding the height above O where the collision takes place. This is simply done by plugging in the value of t=1.5 into one of the earlier equations. I'll use the equation for the second particle, giving s = 22.5 - 4.9*2.25 = 11.475m above O.

Thank you very much :smile:

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