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Problem 3. A runner runs in a straight line with an average velocity of 5ââ m/s for five minutes and then with an average velocity of 4â m/s for four

minutes. (a) What is her total displacement? (b)What is her average velocity during this time? (c) Suppose her goal is to run 5 km in 15 minutes.What average velocity must she have over the remaining portion of her run?

Fig: 1