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Ahmed starts 10.0 m north of the library, riding his bike at a constant speed of 3.50 m/s towards the south. Julia, starting from rest at the library, moves towards Ahmed on her skateboard, speeding up at a constant rate for 2.00s, at which she passes Ahmed. Find Ahmed’s displacement and position at the time that Julia passes him, and also find Julia’s acceleration. (I really need help, I’m completely lost)