What is the vector sum of 5km east and 5km west

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State the right hand rule of the direction of magnetic field in a conductor carrying current

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?