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Define : Average speed...

Define : Average speed

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The total distance travelled by an object divided by the total time taken is called the average speed of the object.
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A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km h^(-1). Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km h^(-1). 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 to 50 min, (iii) 0 to 40 min ? [Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero !]

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A train travels with speed 40 km h^(-1) for first 15 minutes and then 60 km h for next 15 minutes, hence its average speed during this time interval is 50 km h ^(-1).

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Average velocity …... Average speed.