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see I worked through 3a) and I was comparing answers, I saw that they omitted v2 (5m/s) their explanation was because it was "defined in the question" I'm not sure what that means

3)b I tried understanding what's going on but I am clueless unfortunately, how exactly did they get 12.1m ? Where is it from!

All equations and values are attached

3)b I tried understanding what's going on but I am clueless unfortunately, how exactly did they get 12.1m ? Where is it from!

All equations and values are attached