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A man walks on a straight road from his home to a market 2.5 km away with aspeed of 5 km h. Finding the market closed. he instantly turns and walks backhome with a speed of 7.5 km h. What is the(a) magnitude of average velocity, and(b) average speed of the man over the interval of time (i) 0 to 30 min, (ii) 0 to50 min. (ili) 0 to 40 min ? INote: You will appreciate from this exercise why itis better to define average speed as total path length divided by time, and notas magnitude of average velocity. You would not like to tell the tired man onhis return home that his average speed was zero ]

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