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bone wirth a speedon a straight road from his home to a market 2.5 km away withspeed of 5 km h-1. Finding the market closed, he instantly turns and walks baAmanwalkshome 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 () 0 to 30 min, () o50 min. (il) 0 to 40 min? INote: You will appreciate from this exercise whyis better to define average speed as total path length divided by time, andas magnitude of average velocity. You would not like to tell the tired manhis return home that his average speed was zero 11 |
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